identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
039E9712FFD6FFCDFF65FC22FE32FB8B.text	039E9712FFD6FFCDFF65FC22FE32FB8B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Sabellidae Latreille 1825	<div><p>Family Sabellidae Latreille, 1825</p><p>Genus Bispira Krøyer, 1856</p></div>	https://treatment.plazi.org/id/039E9712FFD6FFCDFF65FC22FE32FB8B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFD6FFC0FF65FBB3FA8DF8FE.text	039E9712FFD6FFC0FF65FBB3FA8DF8FE.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Bispira beatrizae Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Bispira beatrizae sp. nov.</p><p>urn:lsid:zoobank.org:act: 20AB5CE4-B1BF-4C9B-8526-F39B055D880E</p><p>(Figs 1–4, 39A–E)</p><p>Material examined. Type material. Holotype, ICML-EMU-14010: TALUD VIII, St. 11, BC, 24º54'24"N 110º25'36"W, 17 April 2005, 895– 920 m. Paratype, ICML-EMU-14011: TALUD XIV, St. 33, BS, 27º47'52"N 111º09'30"W, 11 April 2011, 319– 344 m, 1 specimen . Additional material. ICML-EMU-14012: TALUD XV, St. 1, BS, 23º18'40"N 111º19'37"W, 04 August 2012, 750– 850 m, 13 specimens; ICML-EMU-14013: TALUD XV, St. 5D, BS, 23º16'58"N 110º20'42"W, 05 August 2012, 650– 665 m, 6 specimens; ICML-EMU-14014: TALUD XV, St. 23, BC, 27º08'11"N 114º32'54"W, 01 August 2012, 681 m, 5 specimens .</p><p>Description. Body flattened dorsoventrally (Figs 1A, 3E). Trunk 16 mm long (17 mm), thorax 3.2 mm wide (2.2–3.8 mm); branchial crown 24 mm long (22–23 mm), longer than body length (Figs 1B, 3A), with 16 pairs of radioles (15–16 pairs). Thorax with eight chaetigers (Fig. 1A, C, D), abdomen with 42 chaetigers (40–41 chaetigers). Radiolar lobes slightly involuted ventrally, dorsal basal flanges absent (Fig. 1E). Radioles fused by a palmate membrane as long as the length of five thoracic chaetigers, radioles without flanges, radiolar eyes absent (Fig. 3B–D). Axial skeleton composed of eight skeletal cells at palmate membrane level, vacuolated cells distributed in four transversal rows of two cells each (Fig. 3F–G). Radiolar tips short, filiform (Fig. 3B), occupying the space of five pinnules width. Dorsal lips elongated, finger-like (Fig. 2D–G), without mid-rib radiolar appendages, flaccid (Fig. 3H–I), as long as four thoracic segments; ventral lips small, rounded, poorly developed. Ventral sacs small, about 1/4 the length of collar ventrally, out of crown, mostly covered by ventral lappets (Fig. 2A, C). Three–4 short pairs of undeveloped ventral radioles (not longer than dorsal lips) (Fig. 2E). Collar with whitish anterior margin throughout (Fig. 1C–E); lateral collar margins of even height, covering the junction of crown and thorax (Fig. 1C); dorsal collar margins not fused to faecal groove, separated dorsally by wide gap, anterior peristomial ring exposed dorsally, between collar margins (Fig. 1E); ventral collar margin incised, forming two small rounded, not overlapped ventral lappets (Figs 1D, 2A). First segment slightly longer than following thoracic chaetigers, in ventral view; collar ventral shield (first chaetiger) with anterior margin distinct, W-shaped, followed by two teardrop shaped anterior marks, following thoracic shields rectangular (Fig. 2A); thoracic tori all separated from ventral shields (Figs 1D, 2A). Interramal eyespots absent on thorax (Fig. 1C). Wide faecal groove on thorax (Fig. 1E), thin and narrow on abdomen, ventrally. A visible brown inverted V-shaped mark throughout thoracic epithelium of the faecal groove, from chaetigers 2 to 5 (seen in holotype and in some additional specimens) (Fig. 1E). Collar chaetae with long broadly hooded chaetae, with thin conspicuous limbation on both sides of the axis; chaetae of following thoracic segments in two groups, superior chaetae long, elongate narrowly hooded (Fig. 39A), with hood as wide as width of shaft, inferior chaetae in two tiers of shorter spine-like chaetae (Figs 4A–E, 39B). Neuropodia with uncini progressively smaller ventralwards; uncini with around 8–10 rows of teeth above main fang, all similar in size, occupying half of main fang length; well-developed breast, long neck and short handle of similar length to distance between main fang and breast (Figs 4H, 39C), slightly longer in ventralmost uncini; companion chaetae with distal teardrop shaped membranes (Figs 4F, 39E). Small black interramal eyespots present on abdomen, more conspicuous on posterior half of abdomen (Fig. 2B, pointed with arrows).Abdominal neurochaetae arranged in C-shape (Fig. 4J), on elevated neuropodia; anterior abdominal neurochaetae narrowly hooded on anterior and posterior rows (Fig. 4G, J); posterior abdominal neurochaetae narrowly hooded on anterior rows, and modified, elongate, narrowly hooded on posterior rows. Abdominal uncini similar to thoracic ones (Figs 4I, 39D), with around eight rows of teeth above main fang and handle as long as distance between main fang and breast. Pygidium with median incision, and two sub-rounded lateral structures; dark small pygidial eyespots on both sides of pygidial lobes (Fig. 2B). Tube made of dark mud with thick inner layer of solidified amber mucus, difficult to tear off.</p><p>Etymology. The species name is derived after Beatriz Yáñez-Rivera, a very appreciated friend and colleague, in recognition of her participation during the cruises TALUD, as well as sorting and curating the polychaetes samples in the laboratory, after cruises. The species-group name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).</p><p>Remarks. Bispira is composed by 24 species (Capa et al. 2021), five of these lack typical, paired, compound eyes along radioles: B. brunnea (Treadwell, 1917), B. oatesiana (Benham, 1927), B. porifera (Grube, 1878), B. secusoluta (Hoagland, 1919), and B. wireni (Johansson, 1927) . Radiolar eyes are also presumably lacking in Bispira sp. nov. sensu Goffredi et al. (2020: fig. 4A–B), a peculiar species discovered in methane seeps from Jaco Scar, Costa Rica, at depths of 1,768 to 1,887 m (Goffredi et al. 2020). Bispira sp. nov. sensu Goffredi et al. (2020) is the first sabellid known to live in chemosynthetic bacterial symbiosis, where strains of methanotrophic Methylococcales bacteria were embedded in the cuticle of the radioles. Bispira sp. nov. sensu Goffredi et al. (2020) has a long branchial crown but a description of other morphological features is not included in the original paper to properly compare it with Bispira beatrizae sp. nov.</p><p>Among the species without radiolar eyes, B. porifera is unique by the presence of peristomial and thoracic spongy cushions (Knight-Jones &amp; Perkins 1998; Tovar-Hernández et al. 2020), a feature absent in members of the other species (i.e., B. brunnea, B. oatesiana, B. secusulota, B. wireni, and B. beatrizae sp. nov.). Bispira brunnea is distinctive by having long, triangular, overlapping ventral lappets of collar, extending to the distal end of palmate membrane (Knight-Jones &amp; Perkins 1998; Tovar-Hernández &amp; Pineda-Vera 2008; Dávila-Jiménez et al. 2017); in specimens of all the other species, ventral lappets are low and rounded. Bispira oatesiana, B. secusulota and B. wireni have radiolar flanges and interramal eyespots on thorax and abdomen; in individuals of B. beatrizae sp. nov., radiolar flanges are absent and interramal eyespots are present only on posterior part of the abdomen. Bispira oatesiana has a radiolar skeleton composed of four vacuolated cells at the base, and those animals were found between 80–90 m deep; six vacuolated cells in B. secusulota, 290 m deep; and eight cells in B. wireni, originally described from 150–300 m deep, and then reported to 1,335 m deep, in a hydrothermal vent (Knight-Jones &amp; Perkins 1998; Capa et al. 2013a).</p><p>Bispira beatrizae sp. nov., and B. wireni radioles both have the axial skeleton composed of eight skeletal cells at the zone of palmate membrane, but the cellular arrangements is opposite: in B. beatrizae sp. nov., vacuolated cells are distributed in four transversal rows of two cells each, versus two transverse rows of four cells each in B. wireni . Other differences between members of these species are the following: 1. Ventral sacs are small, about 1/4 of the length of collar ventral in B. beatrizae sp. nov., versus ventral sacs long in B. wireni (exceeding the length of collar ventrally); 2. Dorsal lips elongated, flaccid, finger-like, without mid-rib radiolar appendages, as long as the length of four thoracic segments, in specimens of B. beatrizae sp. nov., versus dorsal lips triangular, with radiolar appendages, about the length of two thoracic segments in B. wireni; 3. Radiolar flanges absent in individuals of B. beatrizae sp. nov., versus present, broad in B. wireni; 4. In members of B. beatrizae sp. nov., the branchial crown is remarkably longer than the body length versus as long as body in B. wireni; 5. Interramal eyespots are present only on posterior abdomen in specimens of B. beatrizae sp. nov., versus present on thorax and abdomen in B. wireni .</p><p>No species of Bispira has been described with flaccid, finger-like dorsal lips, similar to those present in B. beatrizae sp. nov., lacking the mid-rib radiolar appendage support. Bispira beatrizae sp. nov., and another new species of Bispira were found in the same sample. A comparison between both species is included below.</p><p>Abiotic conditions. The specimens of B. beatrizae sp. nov., were collected from 319–920 m deep, under the following environmental conditions. Temperature: 5.00–10.4°C; salinity: 34.45–34.55; dissolved oxygen: 0.07– 0.20 ml O 2 /l; % MO: 5.15–10.03; sediments dominated by silt (46.6 to 82.9%) (Table 1).</p><p>Distribution. Northern and southern Gulf of California, and west coast of Baja California Sur, Mexico.</p></div>	https://treatment.plazi.org/id/039E9712FFD6FFC0FF65FBB3FA8DF8FE	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFDCFFC5FF65FF1BFD91F9CE.text	039E9712FFDCFFC5FF65FF1BFD91F9CE.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Bispira nunezi Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Bispira nunezi sp. nov.</p><p>urn:lsid:zoobank.org:act: 9D2AE88C-C40C-4D90-A145-C80D68EA0906</p><p>(Figs 5–6, 39F–J)</p><p>Material examined. Type material. Holotype, ICML-EMU-14015: TALUD VIII, St. 11, BS, 24º54'24"N 110º25'36"W, 17 April 2005, 920 m, attached to a bryozoan mat.</p><p>Description. Body flattened dorsoventrally. Trunk 14 mm long, thorax 1.2 mm wide; branchial crown 10 mm long, shorter than body length, with nine pairs of radioles. Thorax with eight chaetigers, abdomen with +42 chaetigers. Radiolar lobes slightly involuted ventrally, dorsal basal flanges absent (Fig. 5A). Radioles fused by palmate membrane, radioles with flanges and 10 paired serrations along radiolar length, more pronounced distalwards (Fig. 5D–F), radiolar eyes absent. Radiolar tips of medium length, occupying space of 13 pinnules width, filiform (Fig. 5D, G). Dorsal lips elongated, erect, finger-like, mid-rib radiolar appendages not discernible, 2.5 mm long, as long as thorax; ventral lips small, rounded, poorly developed. Ventral sacs about 1/2 length of collar ventrally, out of crown (Fig. 5B). One pair of short, undeveloped ventral radioles (not longer than three thoracic chaetigers). Collar lateral margins diagonal, not covering junction of crown and thorax (Fig. 5A, C); dorsal collar margins not fused to faecal groove, separated dorsally by wide gap, anterior peristomial ring exposed dorsally, between collar margins (Fig. 5A); ventral collar margin incised, forming two small subtriangular, not overlapped ventral lappets (Fig. 5B). First segment slightly longer than following thoracic chaetigers, in ventral view; collar ventral shield with anterior margin distinct, W-shaped, following thoracic shields rectangular; thoracic tori all separated from ventral shields (Fig. 5B). Interramal eyespots absent throughout. Wide faecal groove on thorax (Fig. 5A), thin and narrow on abdomen, ventrally. Collar chaetae with long broadly hooded chaetae, conspicuous limbation thin, on both sides of the axis; chaetae of following thoracic segments in two groups, superior chaetae long, elongate narrowly hooded (Fig. 39F), inferior chaetae in two tiers of shorter spine-like chaetae with hood as wide as shaft (Figs 6A–B, 39G). Neuropodia with progressively smaller ventralwards uncini; uncini with around 8–10 rows of teeth above main fang, all similar in size, occupying half of main fang length; breast well-developed and short handled (Fig. 39H), as long as distance between main fang and breast, slightly longer in ventralmost uncini; companion chaetae with distal teardrop shaped membranes (Fig. 6C, F). Abdominal neurochaetae arranged in C-shape, on elevated neuropodia; anterior abdominal neurochaetae spine-like on both anterior and posterior rows; posterior abdominal neurochaetae spine-like on anterior rows, and modified, elongate, narrowly hooded on posterior rows (Figs 6D–E, 39J). Abdominal uncini similar to thoracic ones (Fig. 6G), with around eight rows of teeth above main fang and handle similar as long as distance between main fang and breast (Fig. 39I). Pygidium blunt, without pygidial lobes or eyes. Tube made of an inner thick layer of solidified amber mucus, difficult to tear off.</p><p>Etymology. The species is named after the late Arturo Núñez Pasten (RIP), a very friendly, caring and collaborative colleague who participated in many TALUD cruises. The species-group name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).</p><p>Remarks. Within the genus Bispira only two species are known to have radioles with serrations: B. serrata Capa, 2007 (described from Queensland, Australia) and B. nunezi sp. nov. In the holotype and only known specimen of B. nunezi sp. nov., radiolar serrations are found through all the radiolar length, separated from each one by wide gap, whereas in members of B. serrata serrations are only present distally, closer to one another. In addition, members of B. serrata have paired compound eyes, which are absent in the holotype of B. nunezi sp. nov.</p><p>The specimens of B. nunezi sp. nov., and B. beatrizae sp. nov., were found in the same sample. Both species, however, differ in the following aspects: 1. the holotype of B. nunezi sp. nov., has ventral sacs fully exposed above ventral lappets, as long as 1/2 length of collar ventrally (short, as long as 1/4 the length of collar ventrally and mostly covered by ventral lappets in members of B. beatrizae sp. nov.). Radioles of Bispira nunezi sp. nov., have wide radiolar flanges (flanges absent in Bispira beatrizae sp. nov.); 2. the holotype of B. nunezi sp. nov., does not have abdominal interramal eyespots (present on posterior abdominal segments of members of B. beatrizae sp. nov.); and 3. the anterior peristomial ring is exposed laterally between collar margins in the holotype of B. nunezi sp. nov., whereas it is covered by collar in members of Bispira beatrizae sp. nov. only exposed dorsally.</p><p>Abiotic conditions. The specimen of B. nunezi sp. nov., was collected from 920 m deep, under the following environmental conditions. Temperature: 5.00°C; salinity: 34.50; dissolved oxygen: 0.20 ml O 2 /l; %MO: 6.03; sediments dominated by mixed mud (71.1%) (Table 1).</p><p>Distribution. Southern Gulf of California, Mexico.</p><p>Genus Branchiomma Kölliker, 1859</p></div>	https://treatment.plazi.org/id/039E9712FFDCFFC5FF65FF1BFD91F9CE	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFC0FFD9FF65F92EFC4EFACE.text	039E9712FFC0FFD9FF65F92EFC4EFACE.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Chone mollis (Bush 1904)	<div><p>Chone cf. mollis (Bush, 1904)</p><p>(Fig. 8)</p><p>Metachone mollis Bush, 1904, 216, pt. 35, figs 19–20, 28.</p><p>Chone mollis .— Hartman, 1942: 87, figs 141–143.— Hartman, 1944: 279.— Hartman, 1969: 673.— Banse, 1972: 469, fig. 3.— Tovar-Hernández, 2007: 539–543, fig. 10.</p><p>Material examined. ICML-EMU-14018: TALUD X, St. 4, KD, 28º16'06"N 112º32'50"W, 09 February 2007, 587– 633 m, 1 specimen; ICML-EMU-14019: TALUD XIV, St. 20, BC, 28º46'29"N 112º45'40"W, 09 April 2011, 410 m, 13 specimens .</p><p>Description of material examined (n: refer to the number of specimens measured). Trunk 8.3–9.2 mm long (n: 3), thorax 0.9–1.5 mm wide (n: 4), branchial crown 3.3–9.7 mm long (n: 2), nine pairs of radioles (n: 2), eight thoracic chaetigers (n: 6), 26–28 abdominal chaetigers (n: 5). Ratio of posterior peristomial ring collar length versus chaetiger 2 length, in lateral view: 2:1. Radiolar flanges broad. Radiolar tips as long as the space of 10 pinnules width. Anterior peristomial ring partially exposed between collar dorsal margins (Fig. 8B) and exposed ventrally, above collar margin, with a broad triangular base and slightly expanded laterally to triangular tip (Fig. 8C–E, pointed with arrows); collar ventral shield horse-shoe shaped, twice wider than long (Fig. 8A, C). Glandular ridge on chaetiger 2 narrow, homogeneous all around. Thoracic chaetigers with two rows of elongate, narrowly hooded chaetae (Fig. 8I); one anterior row with bayonet chaetae (Fig. 8I); two posterior rows of paleate chaetae with medium length mucros, broken in many chaetae (Fig. 8F–G). Thoracic acicular uncini (Fig. 8J) with main fang surmounted by five rows of teeth. Pre- and post-chaetal lobes well developed. Abdominal chaetigers with two transverse rows of elongate narrowly hooded chaetae. Abdominal uncini with breast rectangular, main fang surmounted by four regular rows of teeth, occupying 1/2 the length of main fang (Fig. 8H). Posterior segments with very elongated, narrowly hooded chaetae. Pygidium with rounded posterior margin.</p><p>Remarks. Chone is composed of 20 species (Capa et al. 2021), plus one new species described below. The phylogenetic relationships within Chone were assessed by Tovar-Hernández (2008), using morphological characters obtained mostly from the study of type material and revising some features such as: dentition of thoracic uncini, shape of anterior and posterior abdominal uncini, and size of a pre-pygidial depression. The analysis revealed the existence of three genera previously assigned to Chone: Dialychone Claparède, 1870, Paradialychone Tovar-Hernández, 2008 and Chone sensu stricto . However, the recognition and placement of specimens in any of these three genera is still problematic due to their small size and because of details of uncini dentition (anterior and posterior abdominal chaetigers) and branchial crown structures (lips and pinnular appendages), that are often difficult to interpret (Capa et al. 2021). As a result, the position of some species within either Dialychone, Paradialychone or Chone based on morphology is uncertain (e.g., P. ambigua Capa &amp; Murray, 2015) and a molecular approach to this group is needed. In the present study, two species of Chone are reported, one confer to C. mollis (Bush, 1904) and a new species described herein, from the Central Gulf of California.</p><p>The specimens examined herein mostly fit the description of C. mollis provided by Tovar-Hernández (2007), except for the length of the mucros of thoracic notochaetae. In members of C. mollis mucros are minute, almost inconspicuous (hair-like), whereas in the specimens here reviewed, mucros are of medium length, but broken in many chaetae.</p><p>Abiotic conditions. The specimens of C. cf. mollis were collected from 410–633 m deep, under the following environmental conditions. Temperature: 8.22–11.40°C; salinity: 34.62–34.90; dissolved oxygen: 0.20–1.94 ml O 2 /l; %MO: 0.94–7.70; sediments dominated by sand or silt (90.4 and 47.6%) (Table 1).</p><p>Distribution. Central and northern Gulf of California, Mexico.</p></div>	https://treatment.plazi.org/id/039E9712FFC0FFD9FF65F92EFC4EFACE	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFC2FFDEFF65FA2AFDFEF903.text	039E9712FFC2FFDEFF65FA2AFDFEF903.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Chone tamai Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Chone tamai sp. nov.</p><p>urn:lsid:zoobank.org:act: 069639A0-4E27-4651-8CF9-55DB1BB09865</p><p>(Figs 9–10, 39K–P)</p><p>Material examined. Type material. Holotype, ICML-EMU-14020: TALUD X, St. 18, BC, 27º09'06"N 111º46'54"W, 12 February 2007, 1,540 m . Paratypes ICML-EMU-14021A, 14021B and 14021C: same data as holotype; paratypes: ICML-EMU-14022A, 14022B, 14022C, ICML-EMU-14023A, 14023B, and 14023C: same data as holotype.</p><p>Description. Trunk cylindrical (Fig. 9A), 5 mm long (5–7.5 mm), thorax 1 mm wide (0.7–1 mm), branchial crown 8 mm long excluding radiolar tips (5.8–9 mm), longer than trunk (Fig. 9A), with seven pairs of radioles, eight thoracic chaetigers (Fig. 9A, E–F), 26 abdominal chaetigers (26–27 chaetigers). Radioles fused by palmate membrane extending up to 3/4 of radiolar length. Radioles with extra long filiform tips, as long as half radiolar length (Fig. 9A–C); long pinnules located at last third of crown, twice as long as basal ones; lateral flanges narrow; one pair of long ventral radiolar appendages about half length of branchial crown (different lengths in paratypes) (Fig. 10G–H). Dorsal lips triangular with mid-rib (Fig. 10G–H); ventral lips triangular, half length of dorsal lips (Fig. 10G–H). Origin of crown not exposed all around (Fig. 9D–F). Ratio of posterior peristomial ring collar length versus chaetiger 2 length, in lateral view: 2:1. Collar entire ventrally, with rounded margin slightly higher than lateral margins (Fig. 9E–F); collar ventral shield horse-shoe shaped, twice wider than long (Fig. 9F); collar lateral margins slightly oblique, covering anterior peristomial ring (Fig. 9E–F). Anterior peristomial ring not exposed beyond collar. Glandular ridge on chaetiger 2 narrow all around, whitish; ventral shields well developed (Fig. 9F). Thoracic notopodia with two groups of chaetae: superior group with elongate, narrowly hooded chaetae (Fig. 10D); inferior group with two rows of chaetae: anterior row with bayonet hooded chaetae (Figs 10A, pointed with arrow, 39M), posterior row with paleate chaetae with long mucros (slightly longer than paleae width) (Figs 10A, 39K). Thoracic neuropodia bearing 10–12 acicular uncini with long handles (≈6 times the length of main fang), 4–5 rows of teeth above the main fang, all similar in size (Fig. 10B), covering 1/2–3/4 of main fang length, hoods present (Figs 10B–C, 39L). Abdominal glandular shields well developed, remarkably swollen (Fig. 9G). Abdominal chaetigers with elongate, narrowly hooded chaetae, those from posterior abdominal chaetigers 25% longer than those of anterior abdominal chaetigers (Figs 10D, 39P). Anterior abdominal uncini with squared to rectangular breast, handles absent (Figs 10E, 39N), dentition as series of nearly uniformly sized teeth, covering 1/2 of main fang on anterior abdominal chaetigers (Fig. 10E); last seven abdominal chaetigers progressively narrower towards pygidium, with shallow pre-pygidial depression (Fig. 9G); uncini from posterior abdominal tori similar in shape from those on anterior abdomen, but smaller and with dentition covering 3/4 of main fang length (Figs 10F, 39O). Pygidium rounded, pygidial eyes and pygidial cirrus both absent (Fig. 9G).</p><p>Methyl green staining pattern. Ventral epithelium stains nearly uniformly, except for distinct inter-segmental grooves and glandular ridge on chaetiger 2 that remains unstained (Fig. 9D–F). Mid-dorsal collar margins unstained (Fig. 9D). Glandular shields stained uniformly.</p><p>Etymology. This species is named after our late colleague Sergio Rendón Rodríguez “Tama” (RIP), a dear friend who provided a very important support during the TALUD cruises and many field-work activities, particularly in the general academic life of the first author. The specific epithet is derived from his nickname, “Tama”, and is a noun in apposition.</p><p>Remarks. The radiolar crown of C. tamai sp. nov., is remarkably long, longer than the body length. The radiolar tips are also distinctly long, half of radiolar length; radiolar tips of similar length of are found in specimens of C. rosea Hartmann-Schröder, 1965 (Tovar-Hernández 2007), but in these latter the collar ventral shield is like a pair of glasses-shaped (horseshoe-shaped in members of C. tamai sp. nov.).</p><p>Except for C. mollis, in which specimens the anterior peristomial ring is exposed between collar ventral margins, in the other North American specimens of Chone that lobe is covered by collar margins. In members of C. aurantiaca (Johnson, 1901), C. gracilis Moore, 1906, C. magna (Moore, 1923), C. picta (Verrill, 1885), and C. tamai sp. nov., the collar ventral shield is horse-shoe shaped, but in specimens of C. aurantiaca, C. magna and C. picta it is as long as wide, whereas in representatives of C. gracilis and C. tamai sp. nov., it is twice wider than long.</p><p>Chone gracilis was originally described from Alaska, from 4 to 56 m deep (Moore, 1906), and previously reported by Méndez (2006, 2013) in samples of the TALUD IV, VI–VII cruises; those records, however, are questionable, requiring re-examination of the specimens. Anyway, in individuals of C. gracilis, the radiolar tips are short and broad lateral flanges run along radioles versus radiolar tips extremely long and radioles without flanges in members of C. tamai sp. nov.</p><p>Abiotic conditions. The specimens of C. tamai sp. nov., were collected from 1,540 m deep, under the following environmental conditions. Temperature: 3.17°C; salinity: 34.59; dissolved oxygen: 0.51 ml O 2 /l. No other environmental data available (Table 1).</p><p>Distribution. Central Gulf of California, Mexico.</p><p>Genus Claviramus Fitzhugh, 2002</p></div>	https://treatment.plazi.org/id/039E9712FFC2FFDEFF65FA2AFDFEF903	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFC5FFD1FF65F94AFDF2FD00.text	039E9712FFC5FFD1FF65F94AFDF2FD00.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Claviramus villalobosi Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Claviramus villalobosi sp. nov.</p><p>urn:lsid:zoobank.org:act: C1B0D1A5-9408-4FA4-B4D8-450D99744B22</p><p>(Figs 11–13, 39Q–S)</p><p>Material examined. Type material. Holotype, ICML-EMU-14024: TALUD XIV, St. 13, BS, 28º31'56"N 112º18'12"W, 08 April 2011, 180‒ 182 m. Paratypes, ICML-EMU-14025A and 14025B: same data as holotype. Paratype, ICML-EMU-14026: same data as holotype.</p><p>Description. Body cream, flattened dorso-ventrally (Fig. 11A). Trunk 4 mm long, thorax 0.7 mm wide (5–5.4 mm long, 0.8 mm wide), longer than abdomen; branchial crown 5 mm long, longer than body in holotype, which radioles are fully extended (Fig. 11A) (3–4.4 mm radioles curled). Crown with nine pairs of radioles (9–10 pairs), thorax with eight chaetigers, abdomen with 17 chaetigers (17 chaetigers). Radiolar lobes semi-circular; ventral radiolar appendages present, of different lengths, 1/4–1/2 length of crown; palmate membrane absent; radiolar flanges only present at radiolar tips, as foliaceous curled flanges, heart-shaped, oval or ditigiform (Figs 11F, 12A– B); some distal flanges without mid-length cleft (entire in oval and digitiform tips), heart-shaped tips with short to medium mid-length cleft; radiolar tips without distal filament; radiolar eyes absent. Dorsal lips triangular with radiolar appendages, ventral lips short, rounded (Fig. 13B). Anterior peristomial ring with ventral margin as broadly triangular lobe, not extending beyond collar margins (Fig. 13D); ventral margin of posterior peristomial ring collar with shallow mid-ventral incision, not forming lappets (Figs 11C, 13D); dorso-lateral collar margins fused to faecal groove (Fig. 11B), dorsal pockets present, with two pairs of large vascular coils, visible by transparency through body wall (Fig. 11B); lateral collar margins slightly higher than ventral and dorsal margins (Fig. 11A–C). Collar with a whitish triangular pad dorsally. Collar shield divided transversally into two pads, anterior pad curved, almost X-shaped posterior pad; ventral shield of chaetiger 2 also divided in two transversal sections, similar to previous shield, but with straight anterior pad; following shields entire, rectangular; abdominal shields as paired squares, separated by faecal groove (Fig. 11C–D). Glandular ridge on chaetiger 2 present, whitish and equally narrow all around (Fig. 11B–C). Chaetiger 1 with rows of narrowly hooded chaetae (Fig. 13C); from chaetiger 2, notochaetal superior group with six narrowly hooded chaetae and two inferior rows of eight paleate chaetae, with long mucros, each (Figs 12C–D, 39Q). Thoracic tori not contacting ventral shields (Fig. 11C), neuropodial uncini acicular (Figs 12F, 39R), each torus with nine uncini with main fang surmounted by 5–6 rows of very small teeth, occupying 1/2 of main fang length, hood absent (Fig. 12F); tip of main fang entire, in frontal view, breast as narrow swelling, and distinctly long handles (Fig. 12F). Abdomen shorter than thorax (Fig. 11A). Abdominal neuropodial fascicles with 1–2 transverse rows of elongate, narrowly hooded chaetae (Fig. 11E); abdominal notopodia with avicular uncini with main fang surmounted by 3–4 rows of small, equally sized teeth, occupying 1/2 of main fang length, long neck, well developed breast and short handle, as long as main fang length (Figs 11G–H, 39S). Pygidium rounded, without eyespots or cirrus (Fig. 11D–E). Tubes made of fine sand. Paratypes ICML-EMU-14025A and ICML- EMU-14026C: females with oocytes floating free in coelom of thoracic and anterior abdominal chaetigers.</p><p>Methyl green staining pattern. Ventral shields along the body fully stained (Fig. 13A, D). Collar with triangular pad dark blue stained, dorsally (Fig. 11B), ventral shield of collar X-shaped fully stained (Fig. 13A, D). Remaining thoracic chaetigers unstained dorsally (Fig. 11B). Laterally, neuropodia covered on glandular spots throughout, dark blue stained (Fig. 11A, D–E). Pygidium blue stained (Fig. 11D–E).</p><p>Etymology. The species name is dedicated to Tulio F. Villalobos-Guerrero, an enthusiast and hardworking colleague, active participant in the TALUD XIV cruise, during which these fanworms were collected. The species-group name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).</p><p>Remarks. Claviramus Fitzhugh, 2002 is a group of six species currently including C. villalobosi sp. nov., described herein, from the northern Gulf of California. Claviramus candelus (Grube, 1863), the type species of the genus, was originally described as Sabella candela Grube, 1863, from the Northern Adriatic Sea. Langerhans (1884) transferred the species to Jasmineira Langerhans, 1880, and described a new species, J. oculata Langerhans, 1884, from Madeira. Cochrane (2000) redescribed the species assigned to Jasmineira in detail, based on the type material and additional specimens, and Fitzhugh established the genus Claviramus, based on the presence of radiolar tips with foliaceous flanges (Fitzhugh 2002: fig. 43), and transferred J. candelus and J. oculata to Claviramus . The third species, C. grubei Fitzhugh, 2002, was described from Thailand, Andaman Sea. Claviramus kyushuensis Nishi, Tanaka &amp; Tovar-Hernández, 2019 was described from Japan. The fifth species was described from Indonesia, C. olivager Tovar-Hernández, ten Hove &amp; García-Garza, 2020 . The diagnosis of the genus was emended by Tovar-Hernández et al. (2020), in order to include the presences of collar vascular coils, thoracic uncini with bifid main fangs, and abdominal ventral shields.</p><p>A peculiarity of species recognized in Claviramus is the presence of a thorax longer than the abdomen, except for C. grubei Fitzhugh, 2002, but this feature requires a re-examination in that species. In type material of C. villalobosi sp. nov., the branchial crown is longer than the trunk whereas in representatives of all the other species in the genus it is shorter than the trunk, and there is, in C. villalobosi sp. nov., a glandular pad in the dorsal side of the collar, a unique, distinctive feature for specimens of the genus.</p><p>Abdominal glandular shields are present in specimens of C. villalobosi sp. nov., C. candelus, C. kyushuensis, and C. olivager, whereas members of C. grubei and C. oculatus lack abdominal shields. Individuals of C. villalobosi sp. nov., mostly resemble specimens of C. olivager, as both share the presence of collar ventral shield transversely divided into two sections, a narrow glandular bar anteriorly, and an almost X-shaped shield posteriorly. However, in members of C. villalobosi sp. nov., a glandular ridge on chaetiger 2 is present whereas it is absent in representatives of C. olivager; and radiolar tips present mid-ventral incisions extending for half of flange length in individuals of C. olivager, whereas members of C. villalobosi sp. nov., have mid-ventral incisions of variable length, from short to medium incisions, to entire margins (not incised).</p><p>Abiotic conditions. The specimens of C. villalobosi sp. nov., were collected from 180‒182 m deep, under the following environmental conditions. Temperature: 12.5°C; salinity: 34.94; dissolved oxygen: 1.25 ml O 2 /l; %MO: 2.47; sediments dominated by sand (69.1%) (Table 1).</p><p>Distribution. Northern Gulf of California, Mexico.</p><p>Genus Euchone Malmgren, 1866</p></div>	https://treatment.plazi.org/id/039E9712FFC5FFD1FF65F94AFDF2FD00	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFCAFFD7FF65FD4EFF27F9CA.text	039E9712FFCAFFD7FF65FD4EFF27F9CA.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Euchone cortezi Reish 1968	<div><p>Euchone cortezi Reish, 1968, re-establishment</p><p>(Fig. 14, Table 2)</p><p>Euchone cortezi Reish, 1968: 94, fig. 19a (erroneously labelled as E. barnardi), fig. 20a–d.</p><p>Material examined. ICML-EMU-14027: TALUD XVI-B, St. 5, BS, 28°48'N 115°24'06"W, 24 May 2014, 772‒ 776 m, 2 specimens, both complete but one broken in two parts (a female with oocytes in thorax) .</p><p>Description of material examined. Body pale with whitish glandular ridge on chaetiger 2 and cream colored shields. Trunk 10.7–13.2 mm long (considering both specimens), thorax 0.8 mm wide. Branchial crown 5.1–7 mm long, with six pairs of radioles, thorax with eight chaetigers, abdomen with 21–27 chaetigers. Branchial lobes semicircular; palmate membrane about 1/2 of radiolar length; narrow radiolar flanges along radioles; radiolar eyes absent. Dorsal lips with short radiolar appendage, dorsal pinnular appendages absent; ventral lips and parallel lamellae both present, ventral sacs absent; one pair of ventral radiolar appendages. Anterior peristomial ring lobe entire, triangular, not exposed beyond collar margins; posterior peristomial ring collar with dorsal margins fused to faecal groove, dorsal pockets present, vascular coils not visible. Ventral margin with long mid-ventral incision, forming pair of rounded overlapped lappets (Fig. 14A–C). Body with biannulate segments; glandular ridge present on chaetiger 2, equally narrow all around; ventral shields with lateral borders well defined in first 4–5 chaetigers, indistinct in the following segments; interramal eyespots absent. Thoracic pre-chaetal and post-chaetal lobes well developed. Collar chaetae narrowly-hooded, in two oblique rows. Superior thoracic notochaetae narrowly hooded (Fig. 14G). Inferior thoracic notochaetae as two transverse groups: anterior row of bayonet chaetae and posterior rows of broadly hooded chaetae (Fig. 14G). Thoracic uncini acicular (Fig. 14H), with 5–6 rows of teeth above the main fang. Abdominal chaetae elongate, narrowly hooded. Posterior chaetigers with modified, elongate, narrowly hooded chaetae. Uncini from anterior abdomen with squared breast (Fig. 14I), with rows of similar-sized teeth above main fang, occupying half its length, handle absent. Uncini from posterior abdomen as rasp-shaped. Pre-pygidial depression composed by 6–7 last abdominal segments, ventral, with pair of triangular flaps at mid-length of anterior margin, lateral margins forming wings (Fig. 14D–F). Pygidium triangular, without cirrus (Fig.14F), pygidial eyespots not seen. Tube made of fine sand.</p><p>Methyl green staining pattern. Homogenous blue coloration ventrally on thorax, except for anterior collar margin, which remains unstained (ventral lappets) (Fig. 14B–C). Thorax unstained with methyl green dorsally (Fig. 14A). Posterior abdomen with scattered blue dots dorsally and ventrally, triangular flaps at mid-length of anterior margin of pre-pygidial depression remain unstained (Fig. 14D–E).</p><p>Remarks. Euchone Malmgren, 1866 is a group of 37 currently known species including those reported by Capa et al. (2021), one new species described below and E. cortezi, here re-established. During the last century, the genus was recognizable by the presence of a typical pre-pygidial depression (anal depression), with lateral wings, but according to Bick &amp; Randel (2005), who analyzed the ontogenic variability in specimens of E. analis (type species of the genus), the pre-pygidial depression with lateral wings is visible only in adult stage. Besides, these authors found that the number of abdominal chaetigers forming the pre-pygidial depression and the shape of the depression are highly variable.</p><p>In the Californias (USA and Mexico), seven species of Euchone have been described: E. arenae Hartman, 1966, from Redondo Beach (California, USA), E. barnardi Reish, 1968, from Bahía de los Angeles (Gulf of California, Mexico), E. cortezi Reish, 1968, from Bahía de los Angeles (Gulf of California, Mexico), E. hanckocki Banse, 1970, from Lasuen Seamount (California, USA), E. limnicola Reish, 1959, from Long Beach (California, USA), E. magna (Fauchald, 1972), from Isla Cerralvo (Gulf of California, Mexico), and E. velifera Banse, 1972, from off Catalina Island (California, USA) (Table 2). However, E. barnardi was synonymized with E. incolor Hartman, 1965 (a species from New England), and E. cortezi with E. arenae, in both cases, according to Banse (1970).</p><p>Banse (1970: 399) had the opportunity to examined one paratype of E. cortezi hosted at the USNM (38405) and stated: “I consider E. cortezi to be a synonym of E. arenae, a species that Reish (1968) had not included in the Discussion of his record. The variability in the number of abdominal segments and the disagreement of the height of the palmate membrane (Hartman, 1966, Reish, 1968) must be noted”. Euchone arenae was described as with 13–15 abdominal chaetigers, six of these composing the pre-pygidial depression, and a palmate membrane less than a fourth of the radiolar length (Hartman 1966), whereas E. cortezi was described as with 12–13 abdominal chaetigers, 5–6 of these forming the pygidial depression, and the palmate membrane extending for one half of the radiolar length (Reish 1968).</p><p>Except for the length of the palmate membrane, the numbers of abdominal chaetigers and segments in the pre-pygidial depression are discrete features which do not strongly support the synonymy. In order to analyze the shape of the pre-pygidial depression, the original description of E. cortezi was reviewed and an edition mistake was detected. Reish (1968: 94) inserted a figure called “ Fig. 20a ” referring to the pre-pygidial depression for E. cortezi, but the “figure 20a” shows a thoracic chaeta and the figure legend stated “ Figure 20.— Euchone cortezi [sic], sp. nov.: a posterior end showing anal depression, b, double winged capillary seta”…., obviously it is an edition mistake.</p><p>Besides, Reish (1968: Fig. 19a) shows a pre-pygidial depression extending for five chaetigers but the figure legend stated that “ Figure 19.— Euchone barnardi [sic], sp. nov.: a, a double winged capillary seta from…”. Euchone barnardi was described in Reish (1968: 93), with a pre-pygidial depression occupying three chaetigers; the pre-pygidial depression showed in his figure 19A has five chaetigers, as described for E. cortezi (not three, as for E. barnardi), consequently this fact also confirms the edition mistake.</p><p>Thus, reviewing the pre-pygidial depression in Reish (1968: Fig. 19a), the presence of two triangular flaps in the mid-anterior margin is remarkable (Table 2). These flaps were also found in the specimens from the TALUD XVI-B cruise reviewed herein (Fig. 14D–E). For comparison, the original drawing of E. arenae by Hartman (1966: pl. 6, fig. 6) shows a pre-pygidial depression with smooth anterior margin, without any flap (Table 2). The triangular flaps at the anterior margin of the pre-pygidial depression constitute a distinctive feature to separate members of both species (present in E. cortezi, absent in E. arenae), in addition to the extension of the palmate membrane (a half of the radiolar length in members of E. cortezi, less than a fourth of the radiolar length in representatives of E. arenae). As material examined here is also from the Gulf of California and matches the original description and drawings by Reish (1968), we use the available name E. cortezi for the ecoregion, proposing also its re-establishment.</p><p>Abiotic conditions. The specimens of E. cortezi were collected from 772‒1,030 m deep, under the following environmental conditions. Temperature: 5.00°C; salinity: 34.42; dissolved oxygen: 0.22 ml O 2 /l; %MO: 8.95; sediments dominated by silt (72.7%) (Table 1).</p><p>Distribution. Central Gulf of California (Reish 1968), off the West coast of Baja California, Mexico (present study).</p></div>	https://treatment.plazi.org/id/039E9712FFCAFFD7FF65FD4EFF27F9CA	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFCCFFE9FF65F92EFD8EFD21.text	039E9712FFCCFFE9FF65F92EFD8EFD21.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Euchone mercedesae Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Euchone mercedesae sp. nov.</p><p>urn:lsid:zoobank.org:act: 8F4D296A-4C96-452F-B8CF-3238DF52709F</p><p>(Figs 15–17, 39T–W, Table 2)</p><p>Material examined. Type material. Holotype, ICML-EMU-14028: TALUD X, St. 22, BS, 27°02'46"N 110°52'57"W, 13 February 2007, 1582–1586 m . Additional material. ICML-EMU-14029: TALUD VIII, St. 16, KD, 25º24'48"N 110º34'48"W, 18 April 2005, 1030 m, 1 specimen .</p><p>Description. Body pale, whitish glandular ridge on chaetiger 2 (Fig. 15C–D). Trunk 24.7 mm long, thorax 1.7 mm wide. Branchial crown 11 mm long with two semicircular lobes, each with 11 radioles. Thorax with eight chaetigers. Abdomen with 42 chaetigers. Dorsal and ventral basal flanges absent. Palmate membrane short, about 1/4 of radiole length. Narrow radiolar flanges along radioles. Radiolar eyes absent. Dorsal lips with short radiolar appendage, dorsal pinnular appendages absent. Ventral lips and parallel lamellae present, ventral sacs absent. Two pairs of ventral radiolar appendages. Posterior peristomial ring collar with dorsal margins fused to faecal groove (Fig. 15A), ventral margin with short mid-ventral incision (Fig. 15D–E). Anterior peristomial ring lobe entire, triangular. Dorsal pockets of collar present, showing vascular coils inside them (Fig. 15A). Body with biannulate segments in thorax (Figs 15C–D, 16A). Glandular ridge present on chaetiger 2, slightly broader on dorsal side (Fig. 15A–F). Ventral shields rectangular, lateral borders not well defined (Fig. 15D–E). Interramal eyespots absent. Thoracic pre-chaetal and post-chaetal lobes well developed. Collar chaetae narrowly-hooded, in two oblique rows. Following thoracic chaetigers with slightly elevated notopodia; superior thoracic notochaetae narrowly-hooded (Fig. 39T), inferior, elongated broadly-hooded chaetae (Fig. 17A, 39U), additional anterior row of bayonet chaetae present (Fig. 17A). Thoracic neuropodial uncini acicular with rows of similar-sized teeth over main fang covering half its length, poorly developed breast and long handle (Figs 17C–D, 39W). Companion chaetae absent.Abdominal neuropodia low and inconspicuous, with narrowly-hooded chaetae in transverse rows. Anterior abdominal uncini avicular with rows of similar-sized teeth above main fang, occupying half its length, quadrangular breast, handle absent (Figs 17E, 39V); posterior chaetigers with similar-sized teeth over main fang, occupying 3/4 of its length, smaller rectangular breast, handle absent. Pre-pygidial depression ventral, composed by last nine chaetigers, forming a skirt or sheath of same height ventrally and laterally dorsally divided by faecal groove (Fig. 16C–F). Pygidium as a triangular lobe without cirrus. Pygidial eyespots not seen. Tube composed of fine sand.</p><p>Methyl green staining pattern. Homogenous blue coloration ventrally in thorax, except for anterior collar margin that remains unstained (Fig. 15E). Thorax dorsal do not stained with methyl green (Fig. 15F). Posterior abdomen with epithelium covered by scattered blue dots dorsally (Fig. 15E) and blue triangular areas ventrally (Fig. 15F).</p><p>Etymology. This species is named after Mercedes Cordero-Ruiz, in recognition to her long trajectory, working and supporting all laboratory activities related to the TALUD Project. The species-group name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).</p><p>Remarks. The pre-pygidial depression of the specimens here reported from the TALUD project is remarkably different to that of other 36 species recognized in Euchone, but in particular to those described from the Californias (USA and Mexico) (Table 2). It is ventral, composed by the last nine abdominal chaetigers, forming an entire sheath (or skirt) that, when observed either ventrally or laterally is of the same height. When comparing the new taxon with species described from the Californias, the pre-pygidial depression is: sail-like in E. arenae (six chaetigers) and E. velifera (7–9 chaetigers) (Hartman 1966; Banse 1972), with a distinct ridge marking anterior and lateral edges without lateral wings in E. limnicola (10 chaetigers) (Reish 1959); bordered by thickened rim which is continuous anteriorly in E. magna (seven chaetigers) (Fauchald 1972; Fitzhugh 1989: 18); and with two triangular flaps in the mid-anterior margin of the depression, lateral margins forming wings in E. cortezi (Table 2). In Euchone hanckocki Banse, 1970 the pre-pygidial depression is composed by three chaetigers only, but the presence of an anterior ridge or lateral wings is not mentioned in the original description. However, E. hancocki lacks ventral shields (present in Euchone mercedesae sp. nov.) and the anterior peristomial ring lobe is bifid (entire in E. mercedesae sp. nov.).</p><p>Abiotic conditions. The specimens of E. mercedesae sp. nov., were collected from 1,030 ‒1,586 m deep, under in the following environmental conditions. Temperature: 2.78‒5.00°C; salinity: 34.50‒34.60; dissolved oxygen: 0.20‒0.68 ml O 2 /l; %MO: 7.35; sediments dominated by silt (65.4) (Table 1).</p><p>Distribution. Central and southern Gulf of California, Mexico.</p><p>(includes Pacific Ocean only).</p><p>......continued on the next page ......continued on the next page</p>SpeciesType localityPre-pygidial depressionDigital imagen, present study Euchone cortezi Reish, 1968 Euchone hanckocki Banse, 1970Lasuen Seamount, California, USAThree chaetigers; presence of anterior ridge or lateral wings not mentioned in original descriptionNo original drawing Euchone limnicola Reish, 1959Long Beach, California, USATen chaetigers, with a distinct ridge marking anterior and lateral edges; no lateral wings. Drawing taken from redescription by Hartman, 1966 Euchone magna (Fauchald, 1972)Isla Cerralvo, Gulf of California, MexicoSeven chaetigers; described as horseshoe shaped, then interpreted as bordered by thickened rim which is continuous anteriorly according to the revision of the holotype by Fitzhugh (1989) Euchone velifera Banse, 1972<p>Genus Fabrisabella Hartman, 1969</p></div>	https://treatment.plazi.org/id/039E9712FFCCFFE9FF65F92EFD8EFD21	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFF2FFEFFF65FD6BFD9FFE13.text	039E9712FFF2FFEFFF65FD6BFD9FFE13.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Fabrisabella vasculosa Hartman 1969	<div><p>Fabrisabella vasculosa Hartman, 1969</p><p>(Fig. 18)</p><p>Fabrisabella vasculosa Hartman, 1969: 699, figs 1–4.— Fitzhugh, 1989: 70.</p><p>Material examined. ICML-EMU-14030: TALUD XV, St. 20, BS, 26º30'42"N 113º56'0"W, 01 August 2012, 540– 568 m, 1 specimen without abdomen. ICML-EMU-14031: TALUD XV, St. 23, BC, 27º08'11"N 114º32'54"W, 01 August 2012, 681 m, 1 specimen without posterior thorax and abdomen .</p><p>Description of material examined. Thorax 1.5 mm wide. Branchial crown 4–4.2 mm long with 12 pairs of radioles. Thorax with eight chaetigers. Abdominal chaetigers unknown (incomplete specimens). Radioles fused basally by reduced palmate membrane. Radioles with narrow flanges along the entire length. Radiolar tips short, filiform, occupying space of 4–5 pinnules width. Radiolar eyes absent. Dorsal lips low, curved slightly at the same angle as the radiolar lobes, without mid-radiolar appendage (Fig. 18B). Ventral lips small, rounded. Parallel lamellae absent. Ventral radiolar appendages present, 3–5 pairs, small, not longer than collar segment length (Fig. 18B).Ventral margin of collar with a narrow median-incision, forming two discrete rounded lappets (Fig. 18C) with brownish spots at their base (Fig. 18C). Lateral collar margin entire, diagonal, exposing partially the anterior peristomial ring (Fig. 18E). Mid-dorsal collar margins fused to faecal groove, dorsal margin continues in U-shaped pockets, exposing in full two pairs of distinct brown vascular coils (Fig. 18D). Anterior pair of coils larger than posterior pair (Fig. 18D). Glandular ridge on chaetiger 2 present, narrow and whitish dorsally (Fig. 18A), ventrally vestigial. Thoracic shields well developed, rectangular with well defined lateral borders (Fig. 18C). Thoracic notochaetae with superior and inferior groups of chaetae. Superior thoracic notochaetae elongate narrowly hooded. Inferior thoracic notochaetae with 1–2 transversal rows of paleate chaetae. Bayonet chaetae absent. Thoracic uncini acicular, teeth above the main fang equal in size, extending 1/2 of the main fang length. Abdomen and pygidium unknown. Tubes not preserved. Specimen St. 23 a female with mature oocytes developing in thorax.</p><p>Remarks. Fabrisabella is composed of two species (Capa et al. 2021). Fabrisabella vasculosa was described from 11.6 mi SW off Point Vicente lighthouse, Southern California, USA, to 731 m depth, and F. similis Fauchald, 1972 from 35 mi off Cabo Corrientes lighthouse, Jalisco, Mexico, to 2,650 m depth. In the present study, F. vasculosa is reported for the first time in Mexican waters. The material examined fits well with original description by Hartman (1969). Since its establishment the species has not been reported or illustrate, except for the re-examination of the holotype by Fitzhugh (1989).</p><p>In F. vasculosa there are two pairs of vascular coils whereas in F. similis there is only one pair. In both species the ventral margin of collar is incised, but in F. vasculosa the lappets are shallow, rounded, whereas these are high, triangular in F. similis . The two specimens examined present entire crowns (no abscission zone/breaking plane at the base of branchial crown) but none of these preserve the abdomen in order to corroborate chaetal and uncinial features.</p><p>Abiotic conditions. The specimens of F. vasculosa were collected from 540‒681 m deep, under the following environmental conditions. Temperature: 6.44‒8.38°C; salinity: 34.45‒34.51; dissolved oxygen: 0.07‒0.15 ml O 2 /l; %MO: 5.15‒5.47; sediments dominated by sand and silt (sand: 46.6, 47.1%; silt: 46.2, 46.6%) (Table 1). Distribution. West coast of Baja California Sur, Mexico .</p><p>Genus Jasmineira Langerhans, 1880</p></div>	https://treatment.plazi.org/id/039E9712FFF2FFEFFF65FD6BFD9FFE13	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFF4FFEEFF65FE3BFD34F8D6.text	039E9712FFF4FFEEFF65FE3BFD34F8D6.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Jasmineira agustinae Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Jasmineira agustinae sp. nov.</p><p>urn:lsid:zoobank.org:act: D45D405E-C4A0-4F1A-8B61-E864A6F08F5F</p><p>(Figs 19–21, 39X–Z 1)</p><p>Examined material. Type material. Holotype, ICML-EMU-14032: TALUD X, St. 5, KD, 28°14'50"N 112°24'53"W, 09 February 2007, 820– 837 m. Paratypes, ICML-EMU-14033A, 14033B and 14033C: same date as holotype. Paratypes, ICML-EMU-14034A: 14034B and 14034C, same date as holotype. Additional material. ICML-EMU-14035: TALUD X, St. 18, BC, 27°09'06"N 111°46'54"W, 12 February 2007, 1,540 m, 1 specimen .</p><p>Description. Body flattened dorso-ventrally (Fig. 19F). Trunk 23 mm long (13.3–23 mm), thorax 1 mm wide (0.5–1.4 mm). Branchial crown remarkably long, 12.3 mm (as long as 3/4 of the body length) (Fig. 19A). Thorax with eight chaetigers. Abdomen with 51 chaetigers (48 to 51 chaetigers). Paratypes with branchial crowns abscised latero-ventrally with diagonal break plane (Fig. 19B, D–E, 20E). Eight pairs of radioles (8–9 in paratypes with abscised crowns), four ventral radiolar appendages (1–6) and radiolar tips long, filiform (Fig. 19C), occupying space of 20–22 pinnules width. Base of branchial crown diagonal, being higher ventrally than dorsally (Fig. 19D– E). Abscised crowns with 8–9 pairs of radioles, base of radioles that remain attached to peristomium with 2–3 dorsal most radioles entire and 1–6 ventral radiolar appendages unequal in length (Figs 19B, D–E, 20A–E). Palmate membrane and radiolar flanges absent. Radiolar eyes absent. Parallel lamellae present, forming a subtriangular structure extending from the mid-ventral margin of collar to the base of branchial crown anteriorly (Fig. 20B–C), extending to ventral lips and surrounding the mouth ventrally. Lateral walls of parallel lamellae and internal wall of ventral lappets, both with brown, spongy tissue. Dorsal lips erect, triangular, with mid-rib. Ventral lips rounded. Lateral collar margins diagonal, entire (Fig. 19D–E), exposing the anterior peristomial ring with two vascular coils in each side (two vascular coils per side in paratype F, four coils per side in paratypes A–E) (Figs 19D–E, 20A, D–G). Ventral collar margins with a mid-incision, forming two subtriangular lappets whose internal margin runs toward the parallel lamellae (Fig. 20B–C, E). Dorsal collar margins fused to faecal groove, forming well developed pockets and two inverse “L” and exposing the anterior peristomial ring and vascular coils (Fig. 20A). Ventral shield of collar with a whitish rectangular base and two anterior triangles divided by mid-incision of collar margin (Fig. 20E). Glandular ridge on chaetiger 2 homogeneously narrow, whitish (Fig. 20D). Thoracic glandular shields rectangular, whitish. Collar chaetae (chaetiger 1) narrowly-hooded arranged in oblique rows. Thoracic chaetigers with two groups of notochaetae (Fig. 21A). Superior group of notochaetae composed of narrowly hooded chaetae (Fig. 21B), inferior group with a row of paleate chaetae with long mucros (Figs 21A, C–D, 39X) and a row of bayonet chaetae with broad hoods (Figs 21E, 39Y). Thoracic tori in contact with ventral shields. Thoracic neurochaetae acicular uncini with long handles and five equal size teeth above the main fangs, hoods absent (Figs 21A, F–G, 39Z). Abdominal chaetae with two groups of elongate, narrowly hooded chaetae, inferior group half shorter than superior group (Fig. 21I). Abdominal uncini with main fang surmounted by teeth of equal size, breast reduced to narrow swelling, long handle (Figs 21H, J, 39Z 1). Pygidium triangular with a fragile cirrus (Fig. 19F) (present in paratypes A–B, D–E, lost in paratype C). Soft tubes covered with fine sand. Holotype with oocytes attached to the internal tube wall.</p><p>Etymology. This species is named after Agustina Ferrando Ostoni, a friend and colleague who took special care at collecting and preserving specimens of worms during her participation in TALUD cruises. The species-group name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).</p><p>Remarks. Jasmineira is a genus with 18 species after the recognition of J. filatovae Levenstein, 1961 in Potamethus (Tovar-Hernández &amp; Jirkov 2024) . Members of Jasmineira usually present an abscission zone (breaking plane) at the base of the branchial crown and vascular coils. The first feature is a pre-established zone of rupture where, under various circumstances, the branchial crown becomes detached from the body (Tovar-Hernández 2008, Capa et al. 2019). Vascular coils are known to deep-sea species of Fabrisabella and Jasmineira, as well as in Euchone analis Krøyer, 1856 (Tovar-Hernández 2007) and Claviramus Fitzhugh, 2002 (Tovar-Hernández et al. 2020). Vascular coils are circular to oval cameras situated dorso-laterally in each side of the peristomium; inside each translucent camera there are vessels than can be seen as a single curved tube or forming entire coils; their structure and function has not been studied yet, but it is very probable that they are vascularized by the central blood vessel according to Tovar-Hernández (2007). In literature, this organ can be found as “glandular tubular organ” (McIntosh, 1916 for Jasmineira princei, cited as Chone), “vascular loops” (Tovar-Hernández 2007, Capa et al. 2019) or “vascular coils” (Hartman 1969; Fauchald 1972; Fitzhugh 1989).</p><p>Only one species of Jasmineira has been reported for the Mexican Pacific: Jasmineira pacifica Annenkova, 1937 . Originally described form the Northern Sea of Japan to 2,900 m depth, it has been reported by González-Ortiz et al. (1996) and Solís-Weiss et al. (2000) from the Gulf of Tehuantepec, Oaxaca to 72 m depth. Unfortunately, diagnosis or illustrations were not provided by these authors in order to compare with the new species herein described, or with the information dealing with J. pacifica provided by Tovar-Hernández &amp; Jirkov (2024).</p><p>Jasmineira agustinae sp. nov., fits well with the diagnosis of Jasmineira provided by Fitzhugh (1989) and Capa et al. (2019), except for the absence of hoods in thoracic uncini (uncini with hoods according to Fitzhugh (1989) and Capa et al. (2019)).</p><p>Jasmineira agustinae sp. nov., have 2 to 4 vascular coils per side (two coils per side in holotype and one paratype, four coils per side in five paratypes). In addition, some coils are well embedded within well defined translucent oval to circular membranes or sacs, but the vessels in others coils seem to be internally communicated. It is unknown if this variation is due to ontogeny or to any other factor. Consequently, the use of this feature to distinguish among species demand additional studies on variability and ontogeny.</p><p>Except for the holotype that has an entire, long branchial crown, paratypes have crowns typically abscised basally. The crown is as long as 3/4 of the body length. Perhaps it is autotomized to distract predators or to replace damaged parts. When fission occurs, only some ventral radiolar appendages and a couple of dorsal radioles remain intact, probably play a role in feeding while a complete regeneration occurs.</p><p>Capa &amp; Murray (2015 a: table 3) provided a comparative table of the Jasmineira species. Based on the features they considered, comparatively Jasmineira agustinae sp. nov., present 8–9 pairs of radioles; four pairs of radiolar appendages; collar lateral incisions absent; collar mid-ventral incision present; collar ventral lappets low; subtriangular collar anterior margin smooth; vascular coils present, well-developed; 48–51 abdominal chaetigers and pygidial cirrus present. As the number of radioles, radiolar appendages and number of abdominal chaetigers may be size-dependent variables, the shape of collar seems to be the most useful feature to distinguish species.</p><p>Among the species that have collar with ventral lappets, in four species these structures are elongate ( J. analis Ehlers, 1908, J. bilobata Day, 1973, J. lobata Fitzhugh, 2002 and J. princei McIntosh, 1916) whereas in J. elegans Saint-Joseph, 1894, J. filiformis Hartman, 1965, J. kikuchi Nishi, Tanaka, Tovar-Hernández &amp; Giangrande, 2009, J. pacifica Annenkova, 1937, J. regularis Hartman, 1978 and Jasmineira agustinae sp. nov., ventral lappets are low. In J. kikuchi ventral lappets are squared, of the same height as lateral collar margins; in J. elegans and J. regularis lappets are rounded, but slightly overlapped in the second species; in J. pacifica the ventral margin of collar was described as “The collar on the ventral side is high, covering the base of the radioli, clearly deeply cut into 2 lobes located one on top of the other on the ventral side” (translation of Russian from Annenkova, 1937: 195–196); in J. filiformis the shape of ventral lappets was not described or illustrated by Hartman (1965), but the dorsal collar margins are not fused to faecal groove and anterior peristomial ring is fully exposed dorsally (Hartman, 1965: pl. 52, fig. a).</p><p>The new species here proposed, Jasmineira agustinae sp. nov., is unique by having ventral lappets subtriangular, extending to long parallel lamellae, as well as dorsal collar margins fused to faecal groove, forming well developed pockets and two inverse “L”, exposing the anterior peristomial ring and the vascular coils.</p><p>Abiotic conditions. The specimens of J. agustinae sp. nov., were collected from 820‒1,540 m deep, under the following environmental conditions. Temperature: 3.17‒4.94°C; salinity: 34.53‒34.59; dissolved oxygen: 0.11‒0.51 ml O 2 /l; %MO: 7.13‒8.01; sediments dominated by silt (78.6%) (Table 1).</p><p>Distribution. Central Gulf of California, Mexico.</p></div>	https://treatment.plazi.org/id/039E9712FFF4FFEEFF65FE3BFD34F8D6	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFF9FFE6FF65FF53FCCBFB5E.text	039E9712FFF9FFE6FF65FF53FCCBFB5E.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Myxicola bruscai Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Myxicola bruscai sp. nov.</p><p>urn:lsid:zoobank.org:act: D8711DFC-C6C4-4B36-9CDC-96E04039A3EC</p><p>(Figs 22–24, 40A–D, Table 3)</p><p>Material examined. Type material. Holotype, UANL-8273: <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-110.37&amp;materialsCitation.latitude=24.426945" title="Search Plazi for locations around (long -110.37/lat 24.426945)">Southern Gulf of California</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-110.37&amp;materialsCitation.latitude=24.426945" title="Search Plazi for locations around (long -110.37/lat 24.426945)">Baja California Sur</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-110.37&amp;materialsCitation.latitude=24.426945" title="Search Plazi for locations around (long -110.37/lat 24.426945)">San Gabriel</a>, Isla <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-110.37&amp;materialsCitation.latitude=24.426945" title="Search Plazi for locations around (long -110.37/lat 24.426945)">Espíritu Santo</a>, Bahía de La Paz, 24º25'37"N 110º22'12"W, 3 m, April 2014, Coll. de León-González, J.A.</p><p>Description. Body plump, cylindrical, purple in thorax (Fig. 22A). Trunk 30 mm long, thorax 4 mm wide. Branchial crown 20 mm long, with semi-circular radiolar lobes fused dorsally, bearing 20 pairs of radioles. Thorax with eight chaetigers. Abdomen incomplete, only 15 chaetigers (posterior end missing). Palmate membrane along 3/4 of the radiolar length (Figs 23A, 24A). Radiolar flanges extend above the distal margin of palmate membrane for a short distance (Fig. 24C). Radiolar tips bare, filiform without radiolar flanges, 4.5 mm long (as long as 1/4 the radiole length) (Figs 23A, 24A–B). Each radiole with a pair of oval compound eyes (Figs 23A–E, 24B), each eye with tear-drop shaped ommatidia (Fig. 23B, D–E). Dorsal lips short, rounded (ear-shaped seen from inner margins of radiolar lobes) without radiolar appendage (Fig. 24C–D) (not visible in any angle of view). Ventral lips extending dorsoventrally along inner surface of base of radiolar lobes and connecting ventrally to the radiolar lobes. Parallel lamellae and ventral sacs absent. Posterior peristomial ring collar absent. Anterior peristomial ring with triangular ventral lobe, distally entire (Fig. 22C); laterally with a deep groove extending to the collar chaetiger (Fig. 22F). Two whitish glandular ridges: a narrow one on chaetiger 1, a broad one on chaetiger 2 (Fig. 22B–C, E–F). Ventral shields absent throughout. Interramal eyespots absent. Thoracic chaetigers with almost inconspicuous notopodia, surrounded by a purple oval-shaped areas (Fig. 22F), with elongate, narrowly hooded chaetae (Figs 23G, 39A). Thoracic neuropodia with acicular uncini with curved tips as hooks, each equipped with two narrow teeth above the main fang, hood absent (Figs 23H, 39B). Companion chaetae absent. A pair of whitish, longitudinal glandular bands in thoracic segments 5–8 and in all abdominal segments, located dorsally and ventrally (Fig. 22D pointed with arrows, G). Lateral eyes in abdomen absent. Abdominal neurochaetae narrowly-hooded. Abdominal notopodial tori not forming complete cinctures around the body (cinctures interrupted in middle region of each segment for 1/2 of its width, dorsally and ventrally). Avicular abdominal uncini with one row of two teeth above the main fang, breast well developed and handle minute (Figs 23F, 39C–D). Pygidium unknown. Tube not preserved.</p><p>Etymology. The name of this species is in honor of Richard C. Brusca (Arizona-Sonora Desert Museum), in recognition of his legacy to the knowledge of marine invertebrates, biogeography and conservation of the Gulf of California. The species-group name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).</p><p>Remarks. Myxicola is a genus composed of 18 valid species (Darbyshire 2023, Putignano et al. 2023, 2024). Until few years ago, the type species, Myxicola infundibulum (Montagu, 1808) was considered cosmopolitan, mostly due to the synonym of many other taxa under that name. It has been considered as an anthropogenically introduced species in some regions (Darbyshire, 2023). For the Mediterranean Sea only, Putignano et al. (2023) recovered and named four new species previously recognized as M. infundibulum .</p><p>Regarding the genus Myxicola in North America, there are two recent contributions re-establishing M. conjuncta Bush, 1905, M. affinis Bush, 1905, M. glacialis Bush, 1905 and M. pacifica Johnson, 1901 for the Pacific Ocean, thus all four were considered valid species (Putignano et al. 2023, 2024), while M. monacis Chamberlin, 1919 was regarded as a junior synonym of M. affinis (Putignano et al. 2024) . In addition, specimens from the Gulf of Maine originally identified as Myxicola infundibulum were found to belong to two new species: Myxicola bushae Putignano, Langeneck &amp; Giangrande, 2024 and M. boki Putignano, Langeneck &amp; Giangrande, 2024 .</p><p>Myxicola infundibulum has also been also reported in the Mexican Pacific but a revision of these records is also needed (see Tovar-Hernández &amp; Fitzhugh, 2021, and references therein). From the TALUD Project no species of Myxicola has been reported (see Méndez, 2006, 2007, 2009, 2012, 2013). Here we recognize two new species of Myxicola from the Gulf of California based on an unique combination of features. The first one from shallow water (3 m depth) in the southern Gulf of California ( Myxicola bruscai sp. nov.) and the second one from deep-sea samples of the TALUD Project, in depths of 319–681 m in the northern Gulf of California (see their formal description below).</p><p>Myxicola bruscai sp. nov., has a unique combination of features: 1. Subdistal radiolar eyes composed and paired. 2. Two glandular ridges (on chaetigers 1 and 2). 3. Lateral collar margins with a deep groove reaching next chaetiger. 4. Glandular longitudinal bars in posterior thoracic and abdominal segments. 5. Dorsal lips without radiolar appendages, and 6. Abdominal notopodial tori not forming complete cinctures around the body (cinctures interrupted in middle region of each segment for 1/2 of its width, dorsally and ventrally).</p><p>In addition to Myxicola bruscai sp. nov., only two other species of Myxicola are known with subdistal radiolar eyes: Myxicola ommatophora Grube, 1878 (from the Philippines) and Myxicola nana Capa &amp; Murray, 2015 (from Lizard Island, Australia). These species differ from Myxicola bruscai sp. nov., in the following aspects. In M. nana and M. ommatophora the anterior ventral lobe is low and rounded, whereas in M. bruscai sp. nov., it is long and triangular. The palmate membrane extends 3/4 of the radiolar length in M. bruscai sp. nov., and M. ommatophora whereas in M. nana it occupies only 1/3 of the radiolar length. In addition, M. bruscai sp. nov., present two glandular ridges: on chaetigers 1 and 2, respectively (only one glandular ridge on chaetiger 2 in M. nana and M. ommatophora). Glandular longitudinal bars in posterior thoracic and abdominal segments are only present in M. bruscai sp. nov., (absent in M. nana and M. ommatophora). Myxicola nana has red, lateral eyespots on abdominal segments (absent in M. bruscai sp. nov., but presence/absence unknown in M. ommatophora).</p><p>When comparing with the species of Myxicola recognized from the Pacific side of North America by Putignano et al. (2023, 2024), radiolar eyes are only known in M. bruscai sp. nov. Thoracic interramal eyes were reported as present from chaetiger 4 in M. affinis, from chaetiger 5 in M. conjuncta Bush, 1905, and poorly visible in M. pacifica Johnson, 1901 without indications on which chaetiger these eyes are located (Table 3). In contrast, M. glacialis Bush, 1905 and M. bruscai sp. nov., lack thoracic interramal eyes. Lateral eyes in abdomen are present in a dorsal position in M. affinis and M. conjuncta, present but poorly visible in M. pacifica, whereas these are absent in M. bruscai sp. nov. (Table 3). Dorsal lips with long radiolar appendages are present only in M. affinis and in the new species described below from the TALUD project; dorsal lips with remarkably short radiolar appendages were reported in M. conjuncta and M. pacifica; and dorsal lips without radiolar appendages are reported in M. glacialis and M. bruscai sp. nov. There are also minor differences in the shape, length and presence/absence of lateral flanges on radiolar tips (Table 3). A comparison of M. bruscai sp. nov., and the second new species from deep-sea samples of the TALUD Project is presented below.</p><p>Abiotic conditions. The specimen of M. bruscai sp. nov., was collected in 3 m deep. No other environmental data available.</p><p>Distribution. Southern Gulf of California, Mexico.</p></div>	https://treatment.plazi.org/id/039E9712FFF9FFE6FF65FF53FCCBFB5E	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFFDFFFBFF65FA9AFDB8FB5F.text	039E9712FFFDFFFBFF65FA9AFDB8FB5F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Myxicola dilianae Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Myxicola dilianae sp. nov.</p><p>urn:lsid:zoobank.org:act: C8B14500-7F10-4C08-A4C4-4A99B4BA31FE</p><p>(Figs 25, 40E–F, Table 3)</p><p>Material examined. Type material. Holotype, ICML-EMU-14036: TALUD XIV, St. 33, BS, 27º47'52"N 111º09'30"W, 11 April 2011, 319– 344 m. Additional material. ICML-EMU-14037: TALUD XV, St. 23, BC, 27º08'11"N 114º32'54"W, 01 August 2012, 681 m, 1 specimen .</p><p>Description. Preserved color pale over body. Body flattened dorso-ventrally (Fig. 25A–B), widest around chaetiger 4, then tapering posteriorly to a blunt pygidium. Trunk 11.7 mm long, body 1.5 mm wide. Branchial crown 7.8 mm long with nine pairs of radioles. Thorax with eight chaetigers. Abdomen with 50 chaetigers. Radioles connected by palmate membrane along 7/8 of their length with broad radiolar flanges. Radiolar tip bare, as long as 1/8 the radiolar length, triangular, elongating evenly to tip and surrounded by a semi-transparent broad flange (Fig. 25C). Longest pinnules at 3/4 of the radiolar length, gradually shortening to the end of radiolar membrane. Number of vacuolated skeletal cells not determined. Radiolar eyes absent. Dorsal lips short, rounded with a long radiolar appendage arising from ventral internal border of ventral lips (Fig. 25F). Ventral lips extending dorsoventrally along inner surface of base of radiolar lobes and connecting ventrally to the radiolar lobes. Ventral radiolar appendages, parallel lamellae and ventral sacs absent. Anterior peristomial ring with a mid-ventral, triangular lobe, slightly higher than the length of second chaetiger (Fig. 25D). Anterior peristomial ring lower laterally, with a lateral notch reaching next segment (Fig. 25E). Posterior peristomial ring collar absent. Junction between crown and body not visible. Glandular ridge present on chaetiger 2, whitish, homogeneously narrow (Fig. 25D). Ventral shields not developed (Fig. 25D), except for a reminiscent ventral circular shield on chaetiger 1. Interramal eyespots absent. Thorax with narrowly hooded notochaetae (Fig. 25H). Thoracic tori inconspicuous. Thoracic neurochaetae acicular uncini with long handles; long elongate fang, slightly bent with several minute teeth above and a slight constriction at top of shaft (Figs 25I, 40E). Companion chaetae absent. Lateral eyes in abdomen absent. Abdominal chaetigers with narrowly hooded neurochaetae in less conspicuos tufts. Abdominal notopodial tori forming almost complete cinctures around body (Fig. 25G), with avicular uncini with 1–2 large teeth over main fang (Figs 25J–K, 40F); breast rounded, slightly longer than main fang, handle absent (Fig. 25J–K). Pygidium rounded, eyespots absent. Pygidial cirrus absent. Tube unknown.</p><p>Etymology. This species is named after Dilian Anguas-Cabrera, a hardworking colleague that helped us during the TALUD cruises and other field activities on land, sorting polychaetes from diverse projects on fouling polychaetes. The species-group name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).</p><p>Remarks. The specimen here reported as Myxicola dilianae sp. nov., from the northern Gulf of California closely matches with the redescription provided for Myxicola affinis Bush, 1905 by Putignano et al. (2024), basically in the shape and size of the mid-ventral lobe of the anterior peristomial ring (triangular) and the presence of dorsal lips with radiolar appendages. However, lateral eyes are present in M. affinis starting at chaetiger 4 (absent in Myxicola dilianae sp. nov.) and the glandular ridge on chaetiger 2 is hardly visible in M. affinis (well developed glandular ridge on chaetiger 2 in Myxicola dilianae sp. nov.) (Table 3).</p><p>Myxicola dilianae sp. nov., differs from M. bruscai sp. nov., by: 1. The absence of radiolar eyes (composed and paired in M. bruscai sp. nov.). 2. Radiolar tips triangular with broad lateral flanges (radiolar tips filiform, without flanges in M. bruscai sp. nov.). 3. A well developed glandular ridge only on chaetiger 2 (glandular ridges on chaetigers 1 and 2 in M. bruscai sp. nov.). 4. Lacking glandular longitudinal bars in posterior thoracic and abdominal segments (present in M. bruscai sp. nov.). 5. Dorsal lips with radiolar appendages (radiolar appendages absent in Myxicola bruscai sp. nov.) and 6. Abdominal uncini forming almost complete cinctures around body (cinctures interrupted for a half of the segment width, dorsally and ventrally in Myxicola bruscai sp. nov.) (Table 3).</p><p>Abiotic conditions. The specimen of M. dilianae sp. nov., was collected from 319‒681 m deep, under the following environmental conditions. Temperature: 6.44‒10.4°C; salinity: 34.45; dissolved oxygen: 0.07 ml O 2 /l; %MO: 5.15; sediments dominated by sand and silt (46.6% each) (Table 1).</p><p>Distribution. Northern Gulf of California and west coast of Baja California Sur, Mexico.</p><p>Genus Perkinsiana Knight-Jones, 1983</p></div>	https://treatment.plazi.org/id/039E9712FFFDFFFBFF65FA9AFDB8FB5F	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFE0FFF8FF65FB7EFB4FFA96.text	039E9712FFE0FFF8FF65FB7EFB4FFA96.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Perkinsiana araceliae Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Perkinsiana araceliae sp. nov.</p><p>urn:lsid:zoobank.org:act: 64144F42-6107-4B41-8898-D82EE4619B12</p><p>(Figs 26–27, 40G–K)</p><p>Material examined. Type material. Holotype, ICML-EMU-14038: TALUD XV,St.23,BC, 27º08'11"N 114º32'54"W, 01 August 2012, 681 m. Paratypes, ICML-EMU-14039A and 14039B: same data as holotype. Paratypes, ICML- EMU-14040A and 14040B: same data as holotype. Additional material. ICML-EMU-14041: TALUD VIII, St. 11, BS, 24º54'24"N 110º25'36"W, 17 April 2005, 920 m, 3 specimens . ICML-EMU-14042: TALUD XV, St. 5D, BS, 23º16'58"N 110º20'42"W, 05 August, 2012, 671 m, 5 specimens .</p><p>Description. Body pale, flattened dorso-ventrally. Trunk 37 mm long (44 mm). Body 2.1 mm wide (2.2–2.5 mm). Branchial crown as long as 1/2 of the body length, 6.1 mm long under regeneration (22–34 mm) with 14 pairs of radioles (13–16). Thorax with eight chaetigers. Abdomen with 71 chaetigers (88 chaetigers). Radioles not fused by palmate membrane (Fig. 26A). Radiolar flanges absent (Fig. 27C–D). All radioles with short, digitiform tips, as long as the space of one pinnule (Fig. 27C–D). Longest pinnules at the last third of radiole (Fig. 27C). Collar margins not covering the bases of radioles (Fig. 26A–D). Dorsal collar margin not fused to faecal groove (Fig. 26A, D). Anterior peristomial ring exposed dorsally (Fig. 26A, D) and laterally (Fig. 26C). Ventral collar margin notched, forming two well developed ventral lappets, rounded, not overlapped (Fig. 27B–E). Parallel lamellae present, well developed (Fig. 26E). Ventral sacs absent. Dorsal lips as long as first three chaetigers (2 mm long), erect, triangular, long, with mid-rib and lateral lamellae, fused to dorsal pinnular appendages (Fig. 27A–B). Ventral lips small, rounded, folded (Fig. 27A–B). Ventral shield of collar divided in two transversal sections, the basal one broader than superior section, with all margins rounded (Fig. 26B). Interramal eyespots absent. Ventral shields well developed, all squared to rectangular (Fig. 26B, E). Thoracic tori occupy the entire distance between notopodia and ventral shield margins, contacting shields (Fig. 27C, E). Thoracic fascicles without developed broad notopodial lips and superior group of elongate, narrowly hooded chaetae (Figs 27E, 40H); and inferior group of paleate chaetae (Figs 27F, 40G), arranged in two rows. Thoracic uncini with crest surmounted by 8–9 rows of numerous minute teeth, handles 2x length of main fang (Figs 27H, 40J), not extending beyond the base of shaft of companion chaetae. Companion chaetae with tear-drop-shaped membranes (Figs 27G, 40I). Abdominal neurochaetae elongate narrowly-hooded chaetae (Fig. 27J). Chaetae from posterior abdomen twice longer than those in anterior abdomen. Abdominal uncini with main fang surmounted by 7–8 rows of numerous minute teeth, handles 1.5x length of main fang (Figs 27I, 40K). Pygidium rim-shaped (Fig. 27F), without eyes. Holotype with crown under regeneration, paratype D with ventral shield of collar under regeneration. Rigid tubes made of an inner thick layer of solidified amber mucus.</p><p>Etymology. This species is named after Araceli Jaquelin Mercado Santiago in recognition of her kind support curating samples included in this contribution, and her contribution to the study on spacial and bathymetric trends of polychaetes in the Gulf of California. The species-group name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).</p><p>Remarks. Perkinsiana is composed of 19 valid species (Capa et al. 2021). There is no evidence of the genus being monophyletic (Fitzhugh 1989, Capa 2007, Tovar-Hernández et al. 2012) but there is a need for a worldwide revision of the genus.</p><p>Six species of Perkinsiana were originally described from America: one from Puerto Rico ( P. fonticula (Hoagland, 1919)) and the rest from Argentina and Chile. In Mexico only P. fonticula has been reported for some Caribbean localities of Quintana Roo state (Tovar-Hernández &amp; Salazar-Vallejo 2006). In the present study, two new species of Perkinsiana are present on the west coast of Baja California Peninsula, both were found together within the same stations and constitutes new records of the genus in Western Mexico.</p><p>Among the currently valid species of Perkinsiana, Perkinsiana araceliae sp. nov., P. brigittae Tovar-Hernández et al. 2012, P. acuminata (Moore &amp; Bush, 1904) and P. minuta (Treadwell, 1941) shares the presence of abdominal chaetae elongate, narrowly hooded (Type C sensu Tovar-Hernández et al. 2012). In P. acuminata the ventral lappets of collar overlap (not overlapped in all other species). The anterior peristomial ring is fully exposed dorso-laterally in Perkinsiana araceliae sp. nov., and P. brigittae, whereas it is not exposed in P. minuta . Perkinsiana brigittae have broad radiolar flanges but flanges are absent in Perkinsiana araceliae sp. nov.</p><p>Abiotic conditions. The specimens of P. araceliae sp. nov., were collected from 671‒920 m deep, under the following environmental conditions. Temperature: 5.00‒6.44°C; salinity: 34.45‒34.55; dissolved oxygen: 0.07‒ 0.20 ml O 2 /l; %MO: 5.15‒10.03; sediments dominated by sand and silt (46.6% each), silt (82.9%) or “mud” (71.1% of combined silt and clay) (Table 1).</p><p>Distribution. South Gulf of California and west coast of Baja California Sur, Mexico.</p></div>	https://treatment.plazi.org/id/039E9712FFE0FFF8FF65FB7EFB4FFA96	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFE3FFFDFF65FAD2FDA4F9CB.text	039E9712FFE3FFFDFF65FAD2FDA4F9CB.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Perkinsiana nuriae Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Perkinsiana nuriae sp. nov.</p><p>urn:lsid:zoobank.org:act: FE61290D-A33E-4DBC-894D-B5A72A09E03A</p><p>(Figs 28–29, 40L‒P)</p><p>Material examined. Type material. Holotype, ICML-EMU-14043: TALUD XV, St. 23, BS, 27º08'11"N 114º32'54"W, 01 August 2012, 681 m. Paratypes (5), ICML-EMU-14044: same data as holotype. Paratypes (5), ICML-EMU-14045: same data as holotype. Paratypes (5), ICML-EMU-14046: same data as holotype. Paratypes, UANL-8274A, 8274B and 8274C: same data as holotype. Additional material. ICML-EMU-14047: TALUD XV, St. 20, BS, 26º30'42"N 113º56'0"W, 01 August, 2012, 540– 560 m, 3 specimens .</p><p>Description. Large sabellid with body pale and crown with 3–5 purple bands distributed over outer and lateral radiole margins and adjacent pinnules (Fig. 28A). Body flattened dorso-ventrally. Trunk 121 mm long (94–124 mm). Body 4.2 mm wide (3.5–5 mm). Branchial crown as long as trunk length, 62 mm long (47–64 mm) with 13 pairs of radioles (12–17). Thorax with eight chaetigers (8–10). Abdomen with 119 chaetigers (107–140). Radioles not fused by palmate membrane membrane (Fig. 28C). Radiolar flanges absent, except for a narrow flange on radiolar tips of ventral radioles (Fig. 29E). All radioles with short, digitiform tips (Fig. 29C–E). Basal most 5–6 pinnules of dorsal most radioles broader than the superior ones (Fig. 29A). Dorsal collar margins U-shaped, fused to faecal groove, forming broad gap (Fig. 28B). Dorsal pockets well developed (Fig. 28B). Lateral collar margins not covering the bases of radioles (Fig. 28C). Ventral lappets small with straight margin, not overlapping (Fig. 28C). Anterior peristomial ring exposed dorsally between dorsal pockets (Fig. 28B). Dorsal lips as long as first three chaetigers (5.5 mm length), erect, triangular, long, with mid-rib, fused to dorsal pinnular appendages (Fig. 29A– B). Ventral lips rounded with ventral parallel lamellae well developed, completely concealed by ventral collar margin (Fig. 29A–B). Ventral sacs absent. Interramal eyespots absent (Fig. 28E). Ventral shield well developed, all rectangular (Fig. 29C). Thoracic tori occupy the entire distance between notopodia and ventral shield margins, contacting shields (Fig. 28C). Thoracic fascicles (Fig. 29H) with well developed broad notopodial lips (Fig. 29F) and superior group of elongate, narrowly hooded chaetae (Figs 29I, 40M); inferior group of broadly hooded chaetae (Figs 29H, I, 40L), arranged in several rows (Fig. 29G). Thoracic uncini with crest surmounted by 9–10 rows of numerous minute teeth, handles 2x length of main fang (Figs 29L, 40N), not extending beyond the base of shaft of companion chaetae. Companion chaetae with teardrop-shaped membranes (Figs 29J, 40N). Abdominal shields well developed, squared, divided by faecal groove (Fig. 28D). Abdominal neurochaetae elongate narrowly-hooded chaetae (Fig. 29K). Abdominal uncini with main fang surmounted by 7–8 rows of numerous minute teeth (Figs 29M, 40P). Chaetae from posterior abdomen twice longer than those in anterior abdomen. Pygidium rim-shaped, without eyes (Fig. 29E). Rigid tubes made of an inner thick layer of solidified amber mucus, hard to tear off, covered with fine sand grains.</p><p>Etymology. This species is named after a dear friend and colleague Nuria Méndez Ubach (RIP). She was in charge of the operations related with the collection of sediments, separation of organisms - particularly the Polychaeta - during all TALUD cruises, from 1989 to 2014. Her sympathy, joy and grace were spreading to the entire crew, making cruises fun and light. The species-group name is a noun in the genitive case (ICZN 1999, Art. 31.1.2).</p><p>Remarks. Perkinsiana nuriae sp. nov., constitutes the largest sabellid known in Mexico, reaching up to 17.9 cm in length (paratype UANL-8274C). Perkinsiana nuriae sp. nov., and P. araceliae sp. nov., were found together within the same stations. Perkinsiana nuriae sp. nov., is remarkable larger than P. araceliae sp. nov., and both have the following differences. In P. araceliae sp. nov., the ventral shield of collar is transversally divided in two areas (it is entire in P. nuriae sp. nov.); the ventral lappets of collar are high and rounded in P. araceliae sp. nov. (low with straight margin in P. nuriae sp. nov.); the mid-dorsal collar margins are not fused to faecal groove in P. araceliae sp. nov. (fused to faecal groove in P. nuriae sp. nov.); the branchial crown is as long as 1/2 of the body length in P. araceliae sp. nov. (as long as body length in P. nuriae sp. nov.); in P. araceliae sp. nov., the notopodial lips are not developed (well developed in P. nuriae sp. nov.); and the inferior group of thoracic notochaeta are paleate in P. araceliae sp. nov. (broadly-hooded in P. nuriae sp. nov.).</p><p>Among the currently valid species of Perkinsiana, P. nuriae sp. nov. has abdominal chaetae elongate, narrowly hooded (Type C) such as P. araceliae sp. nov., P. brigittae, P. acuminata and P. minuta . In P. nuriae sp. nov., the anterior peristomial ring is partially exposed among dorsal lappets (fully exposed dorso-laterally in P. araceliae sp. nov., and P. brigittae, or not exposed in P. minuta). In P. acuminata the ventral lappets of collar are overlapped (not overlapped in P. nuriae sp. nov., and all other species).</p><p>Abiotic conditions. The specimens of P. nuriae sp. nov., were collected from 540‒681 m deep, under the following environmental conditions. Temperature: 6.44‒8.38°C; salinity: 34.45‒34.51; dissolved oxygen: 0.07‒ 0.15 ml O 2 /l; %MO: 5.15‒5.47; sediments dominated by sand and silt (45.2 to 47.1% each) (Table 1).</p><p>Distribution. West coast of Baja California Sur, Mexico.</p><p>Genus Potamethus Chamberlin, 1919</p></div>	https://treatment.plazi.org/id/039E9712FFE3FFFDFF65FAD2FDA4F9CB	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFE6FFF1FF65F9F2FD8BFCA3.text	039E9712FFE6FFF1FF65F9F2FD8BFCA3.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Potamethus pepei Tovar-Hernández & León-González & Hendrickx 2025	<div><p>Potamethus pepei sp. nov.</p><p>urn:lsid:zoobank.org:act: 11632258-41AE-4E59-B879-DF2048D6DF9A</p><p>(Figs 30–31, 40Q–U)</p><p>Material examined. Type material. Holotype, ICML-EMU-14048: TALUD XI, St. 1, KD, 16º52'00"N 100º22'00"W, 07 June 2007, 850 m. Additional material. ICML-EMU-14049: TALUD XV, St. 20, BS, 26º30'42"N 113º56'0"W, 01 August 2012, 498 m, 3 specimens .</p><p>Description. Body pale with a narrow brownish glandular ridge on chaetiger 2 (Fig. 30B–C). Body slightly flattened dorso-ventrally. Body 1.8 mm wide (1.7–1.8 mm in additional specimens). Branchial crown 34 mm long with 11 pairs of radioles (9–11 in additional specimens). Thorax with eight chaetigers (Fig. 30H). Abdomen with +9 chaetigers (holotype and additional specimens incomplete). Radioles not fused by palmate membrane (Fig. 30A–C), not arranged into a spiral, without eyes or flanges. Radioles filiform, very long tips, as long as 5 mm (Fig. 30F–G). Dorsal pinnular appendages absent. Marginal base of crown with parallel lamellae bordering ventrally (Fig. 30B). Anterior and posterior peristomial rings distinctly elongated (Fig. 30A–C). Anterior peristomial ring fully exposed above dorsal collar margins (Fig. 30A). Mid-dorsal margin of anterior peristomial ring triangular (Fig. 30A). Peristomial modules present dorsally. Posterior peristomial ring not covering radiolar bases (Fig. 30A–C). Dorsal collar margins V-shaped, fused to faecal groove, forming dorsal pockets (Fig. 30A). Mid-ventral margin of collar incised, forming two lanceolated lappets (Fig. 30B, D) as long as chaetiger 1. Ventral sacs rounded, exposed outside branchial crown and full of sand (Fig. 30B–C, D). Lateral collar margin oblique (Fig. 30C), elongate toward ventral side, exposing anterior peristomial ring (Fig. 30C). Dorsal lips triangular with mid-rib radiolar appendages and lateral lamellae, dorsal pinnular appendages absent. Ventral lips small, rounded. Ventral shield of collar well developed, as bifid molar-shaped (Fig. 30B, D, H). Two diagonal dark bands at the base of ventral lappets, separated from each other by mid-ventral incision of collar (Fig. 30B, D). Collar chaetae composed of two groups of narrowly hooded chaetae; superior group much longer than two times the length of the inferior group. Ventral thoracic shields well developed, rectangular (Fig. 30B, D, H). Glandular ridge on chaetiger 2 brown (Fig. 30B–C). Thoracic notochaetae with superior group of elongate narrowly hooded chaetae (Figs 31A–B, 40S) and with inferior group of paleate chaetae (Fig. 31A, C). Thoracic uncini avicular, with handles 6–7 times longer than crest length (Figs 31E–F, 40Q); crest without hood, with 5–6 rows of teeth of nearly equal size above main fang, covering half of main fang (Fig. 31E), and with a small hump on the angle between external margin of neck and handle (a slight swelling opposite to breast) (Figs 31E, 40T). Companion chaetae teardrop shaped (Figs 31D, F, G, 40R), with a narrow dentate head and very long tip (+3 times longer than uncinial main fang). Ventral abdominal shields well developed, rectangular, not well marked lateral margins, separated from each other by faecal groove (Fig. 30E, H). Abdominal neurochaetae with two rows of narrowly hooded chaetae, those of inferior row three times shorter than those in superior row (Fig. 31H–I). Abdominal uncini avicular without humps on the angle between external margin of neck and handle (a slight swelling opposite to breast) (Fig. 31J); breast as a narrow swelling, handles 2.5 times longer than crest length (Fig. 31J), main fang surmounted by 4–5 rows of nearly equal-size teeth above main fang, covering half of main fang (Fig. 31J). Posterior end unknown. Tubes not preserved.</p><p>Etymology. This species is named after José Salgado-Barragán (“Pepe”), a dear friend and colleague that supported not only our activities during the TALUD cruises, but also in coastal fieldwork. The specific epithet is derived from his nickname, “Pepe”, and is a noun in apposition.</p><p>Remarks. Potamethus is composed of 13 species (Tovar-Hernández &amp; Jirkov 2024) and the new species described below. This genus includes species mostly from the deep sea. Potamethus filatovae (Levenstein, 1961) is the deepest sabellid ever recorded so far, reaching 9,735 m in depth (Tovar-Hernández &amp; Jirkov 2024). There are only two species described below 100 m: P. breviuncatus Hartmann-Schröder, 1977 and P. japonicus (Johansson, 1922) . In addition, Hernández-Alcántara &amp; Solís-Weiss (1999) reported an unidentified species of Potamethus from sublittoral zone of the Gulf of California. The genus was recently amended by Tovar-Hernández &amp; Jirkov (2024).</p><p>Among the valid species of Potamethus, only three have been described from the Pacific: P. elongatus (Treadwell, 1906) from Hawaii, USA, at 130 m depth, P. japonicus (Johansson, 1922) from Sagami Bay, Japan, at 45–60 m depth and P. mucronatus (Moore, 1923) from Santa Catalina Island, California, USA, at 1,000 m depth. Potamethus mucronatus was reported by Solís-Weiss et al. (2000) in the continental shelf of the Gulf of Tehuantepec (Oaxaca, Mexico). Potamethus elongatus and P. mucronatus were poorly described, but Knight-Jones (1983) reviewed the types of both species. She emphasized that both species lack ventral shields or patches, being the whole epithelium glandular all over. Potamethus pepei sp. nov., has well developed ventral shields, in both the thorax and the abdomen (Fig. 30B–E, H).</p><p>Original description by Johansson (1922: 8–9, pl. I, figs 3–4, pl. IV figs 4–6) for P. japonicus states that ventral shields are well developed but not distinctly limited at the sides. In contrast, Potamethus pepei sp. nov., has shields and its lateral margins are well defined. Besides, P. japonicus was described with 17 thoracic chaetigers (vs. only eight in Potamethus pepei sp. nov.) and thoracic uncini without humps (small hump in Potamethus pepei sp. nov.). The new species here described has a ventral shield of collar bifid molar-shaped, whereas it is rectangular, in P. japonicus and Potamethus elongatus (unknown in P. mucronatus). Ventral lappets were described by Moore (1923) as prominent and round in P. mucronatus, small and rounded in P. japonicus, and lanceolated in Potamethus pepei sp. nov. In other species of Potamethus from worldwide localities the ventral lappets of the collar can be triangular in P. breviuncatus as well as in P. filiformis Hartmann-Schröder, 1977, P. singularis Hartman, 1965 and P. spathiferus (Ehlers, 1887); these are bilobed in P. dubius (Eliason, 1951), and rounded in P. filatovae (Levenstein, 1961), P. malmgreni (Hansen, 1879), P. murrayi (McIntosh, 1916), and P. scotiae (Pixell, 1913) (Tovar-Hernández &amp; Jirkov 2024: tab. 2).</p><p>There is an additional species from California referred to by the Southern California Association of Marine Invertebrate Taxonomists as “ Potamethus sp. A Leslie” and “ Potamethus sp. A Williams” (SCAMIT, 2025). As in Potamethus pepei sp. nov., the Californian species also features ventral shields in thorax, but the ventral lappets of the collar are long, triangular (short, lanceolate in Potamethus pepei sp. nov.), and a short crown (very long in Potamethus pepei sp. nov.).</p><p>Abiotic conditions. The specimens of P. pepei sp. nov., were collected from 498‒850 m deep, under the following environmental conditions. Temperature: 5.00‒8.38°C; salinity: 34.51; dissolved oxygen: 0.14‒0.15 ml O 2 /l; %MO: 5.47; sediments dominated by sand and silt (47.1 and 45.2%) or silt (61.8%) (Table 1).</p><p>Distribution. Off Guerrero and of the West coast of Baja California Sur, Mexico.</p><p>Genus Pseudopotamilla Bush, 1905</p></div>	https://treatment.plazi.org/id/039E9712FFE6FFF1FF65F9F2FD8BFCA3	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FFEAFF8BFF65FCEAFDB2FF4E.text	039E9712FFEAFF8BFF65FCEAFDB2FF4E.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Pseudopotamilla socialis Hartman 1944	<div><p>Pseudopotamilla socialis Hartman, 1944</p><p>(Figs 32–35, Table 4)</p><p>Pseudopotamilla socialis Hartman, 1944: 282–283, pl. 42, figs 53–58.— Tovar-Hernández et al., 2019: 5, fig. 3C.</p><p>Potamilla socialis ?. — Gamboa-Contreras &amp; Tapia-García, 1998: 108 (species list).</p><p>Material examined. UANL-8275: Gulf of California, Sinaloa, Ahome, Topolobampo, Marina Palmira, 25º35'57"N 109º3'29"W, 06 April 2021, 50 cm depth below dock surface, Coll. Tovar-Hernández, M.A. UANL-8276: same locality, St. TOP-A-Q-20210406-1 (dozens). UANL-8277: St. TOP-A-Q-20210406-2 (10 specimens among Scopalina sp.); UANL-8278: same locality, St. TOP-A-Q-20210406-3 (dozens among Suberites aurantiaca); UANL-8279: same locality, St. TOP-A-Q-20210408-9 (dozens among Halichondria aff. panicea). UANL-8280: Gulf of California, Sinaloa, Ahome, Topolobampo, Embarcadero, 25°35.944'N 109°02.894'W, 10 August 2011, intertidal scraped, Coll. Aguilar-Camacho J.M. &amp; Yáñez-Rivera B., 6 specimens. UANL-8281: Gulf of California, Sinaloa, Mazatlán, dock “El Puma”, St. MZT-S-20210424-1, 23º10'53.47"N 109º25'27.40"W, 24 April 2021, 1 m below dock surface, Coll. Tovar-Hernández, M.A., 2 specimens.</p><p>Description of material examined (n: refer to the number of specimens measured). Body long, slender (Fig. 31A). Thorax 1.3–2.7 mm long (n: 14), 0.4–1 mm wide (n: 14). Branchial crown 1.5–3.5 mm long (n: 14) with 7–9 pairs of radioles (n: 14). Thorax with 7–11 chaetigers (n: 14). Abdomen with 37–52 chaetigers (n: 2). Radiolar eyes formulae highly variable (Table 4). Relation between radioles with eyes and total number of radioles: 0/7 to 5/9 (n: 22), being 4/8 the most common pattern (n: 6). Branchial crown asymmetrical with longest radioles dorsally, then decreasing towards ventralmost radioles, which are 1/4 of the length of the dorsalmost radiolar pair (Figs 32B, 33A). Radiolar lobes short, with dorsal and ventral flanges: dorsal pair rectangular, erect, ventral pair rounded (Fig. 33F). Radiolar flanges and palmate membrane absent. Pinnules arranged in two alternating rows, longest at the mid-radiolar length. Radiolar tips short, as long as space of three pinnules width (Fig. 33D). Compound radiolar eyes proximal (basal half of branchial crown), absent in dorsal-most pair (Fig. 32B); spherical to oval, unequal in size and number (Figs 32B, 33C, Table 4). Anterior peristomial ring partially exposed dorso-laterally between dorsal pockets and lateral collar margin (Fig. 32C–D). Posterior peristomial ring collar with dorsal margins fused to faecal groove (Fig. 32D); mid-dorsal margins low, not longer than the base of radioles (Fig. 32D). Ventral lappets triangular, divided mid-ventrally by short incision (Fig. 32E–F). Peristomial eyes present (Fig. 33B). Dorsal lips triangular, erect, with mid-rib radiolar appendages (Fig. 33E); ventral lips short, rounded (Fig. 33F). Ventral sacs present. Chaetiger 1: two rows of broadly-hooded notochaetae. Ventral shield of collar rectangular, slightly divided transversely, higher than the following thoracic shields (Figs 32F, 33A). Chaetigers 2–7, 8, 9, 10 or 11: ventral shields rectangular, divided transversely in two equal parts; tori not contacting ventral shields (separated by a reduced space) (Figs 32E–F, 33A); superior notochaetae elongate narrowly hooded; inferior ones paleate, arranged in two rows, with pointed mucro (Fig. 34J). First thoracic torus with 13–15 neuropodial uncini (n: 10), diminishing gradually in number towards the last posterior thoracic chaetiger, where there are 7–9 uncini (n: 10) (Fig. 35A–C). Neuropodial avicular uncini with several rows of small, similar sized teeth above main fang, breast well developed. Uncini from anterior thoracic chaetigers with handles as long as 2.25 times the length of main fang, a high crest and short neck (as long as 1/2 the length of main fang) (Fig. 34B–C, E). Uncini from the last two thoracic chaetigers with handles longer than those of anterior segments: handle as long as four times the length of main fang, a lower crest than those of anterior segments and a longer neck (as long as 3/4 the length of main fang) (Fig. 34F–G, I). Companion chaetae with symmetrical membranes, teardrop-shaped (Fig. 34D, H), and long handles, as long as handles of uncini. Abdominal neurochaetae elongate broadly-hooded (Fig. 34A, M). Notopodial uncini with several rows of teeth above main fang with a high crest, breast well developed, handles short, as long as the length of main fang (Fig. 34K–L). Pygidium bilobed. Tubes 28–34 mm long (n: 4), narrow 0.8 mm diameter (n: 4), composed by fine sand (Fig. 32A), some covered with sponges, ascidians, members of Hydrozoa and Bryozoa attached in the external wall. Asexual reproduction by architomy. Posterior part of abdomen were found broken by fission, and some buds were found regenerating branchial crowns and posterior ends.</p><p>Methyl green staining pattern. Ventral shield of collar and thoracic shields stains deep blue uniformly. Two remarkable thin, white rectangles in anterior margin of ventral shield of collar (Fig. 35D–G). In collar, some scattered blue spots present in lateral areas of lappets.</p><p>Variation. Radiolar formula is highly variable in specimens from Topolobampo (Table 4), not only in the number of eyes per specimen (considering the right branchial lobe only) but also in the number of radioles containing eyes. The highest number of eyes per specimen was 10 (radiolar formula x4321xxx) in a large specimen with thorax 2–7 mm long, 0.7 mm wide, branchial crown 3.4 mm long, compared with only one eye per specimen (radiolar formula x1xxxx), or even zero eyes per specimen (radiolar formula xxxxxxx). The specimen without eyes is small (thorax 1.5 mm long, 0.7 mm wide, branchial crown 1.5 mm long). The number of radioles with eyes varies from only one radiole with eyes (eye present in one of six radioles: 1/6) to five radioles with eyes (eyes present in five of nine radioles: 5/9).</p><p>Remarks. Pseudopotamilla Bush, 1905 is a genus characterized by the presence of remarkable compound radiolar eyes, except in the dorsalmost radiolar pair (Capa et al. 2019). Some species of Pseudopotamilla are known to bore in hard limestone, dead coral, barnacles and mollusks shells (Chughtai &amp; Knight-Jones 1988; Knight-Jones et al. 2017).</p><p>The number of valid species described in Pseudopotamilla is 23 (Tovar-Hernández et al. 2020) but the status of some nominal species is still questionable. In the case of species of Pseudopotamilla from North America, four were described from Temperate Northern Pacific ( P. debilis Bush, 1905, P. intermedia Moore, 1905, P. occelata Moore, 1905, and P. socialis Hartman, 1944). Pseudopotamilla reniformis (Bruguiére, 1798) has been widely reported in the Mexican Pacific (e.g., Hernández-Alcántara &amp; Solís-Weiss 1999 as Potamilla; Prado-Navarro et al. 2016; Bastida-Zavala et al. 2022) but the distribution of the species seems to be restricted to Iceland, northern Norway, Scotia and Newfound (Knight-Jones et al. 2017). For the TALUD project, P. intermedia was reported previously by Méndez (2006, 2013).</p><p>Tovar-Hernández et al. (2019) included new records of P. socialis as fouler in hulls and docks from La Paz (SW Gulf of California), but a diagnosis or description was not provided due the nature of the publication (an annotated list). In the present study, the records of P. socialis from dock fouling in the Central Gulf of California are reported here in order to provide a description and evidences about the high variability of radiolar eyes formulae, which variation is most probably due to ontogeny; consequently, the number and distribution of eye should be taken with precaution when describing and comparing species in Pseudopotamilla, particularly when few specimens are available for examination.</p><p>Pseudopotamilla socialis was originally described from an intertidal habitat, among sponge masses at Tomales Point (Central California, USA) (Hartman 1944). Specimens from the Gulf of California were also found growing among sponges, ascidians, bryozoans, and hydrozoans in docks. There are no detailed or illustrated reports of Pseudopotamilla socialis since its original description by Hartman (1944) but Contreras &amp; Tapia-García (1998) enlisted “ Potamilla socialis (Hartman, 1944) ” from the inner continental shelf of the Gulf of Tehuantepec (Oaxaca, SW Mexico), a record than posteriorly was referred to as “ Perkinsiana socialis (Langerhans, 1884) ” by Bastida-Zavala et al. (2022: 105), thus demanding a clarification.</p><p>Abiotic conditions. The specimens of P. socialis were collected in shallow water, 0.5–1.0 m below surface, at the base of three sponges ( Halichondria aff. panicea (Pallas, 1766), Scopalina sp. and Suberites aurantiaca (Duchassaing &amp; Michelotti, 1864)) or among massive mats of the invasive ascidians, bryozoans and hydrozoans, under the following environmental conditions. Temperature: 24–26°C; salinity: 35–40.</p><p>Distribution. California, USA (Hartman 1944), southern Gulf of California (Tovar-Hernández et al. 2019), and</p><p>Central Gulf of California (present study) .</p></div>	https://treatment.plazi.org/id/039E9712FFEAFF8BFF65FCEAFDB2FF4E	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
039E9712FF92FF8FFF65FB42FDFBFDA7.text	039E9712FF92FF8FFF65FB42FDFBFDA7.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Hyalopomatus biformis (Hartman 1960) XIV	<div><p>Hyalopomatus biformis (Hartman, 1960)</p><p>(Fig. 37)</p><p>Vermiliopsis biformis (Hartman, 1960): 164, plate 18, figs 1–3.— Hartman, 1969: 777–778, figs 1–7.</p><p>Hyalopomatus biformis .— Zibrowius, 1971: 1374 (transferred to the genus Hyalopomatus).— Bastida-Zavala, 2008: 21, fig. 5E–H.</p><p>Material examined. ICML-EMU-14051: TALUD XIV, St. 7, BC, 28º15'05"N 112º39'20"W, 07 April 2011, 195 m, 1 specimen .</p><p>Description of material examined. Tube white and opaque, with a longitudinal ridge, anterior collar-like shallow rings (without wide flaring peristomes) and a terminal pointed peak (Fig. 37A). Small specimen, 8 mm long, 0.3 mm wide. Branchial crown 3 mm long plus operculum (0.4 mm) with 10 pairs of radioles. Peduncle broader than other radioles. Opercular stalk annulated (Fig. 37B–D). Operculum soft, transparent, semi-globular (pear-shaped), with an anterior end cap that can be visible when seen in different angle, as well as a transverse whitish line under light microscopy (Fig. 37B–D). Pseudoperculum absent. Thorax with six chaetigerous segments, five of which uncinigerous. Number of abdominal segments unknown (parts of tube attached to body). Small bundle of collar chaetae of two types: limbate and fin-and-blade with distal blade separated from basal fin by a short gap.</p><p>Remarks. Hyalopomatus contains 17 nominal species worldwide (one declared incertae sedis), mainly from bathyal and abyssal depths (ten Hove &amp; Kupriyanova 2009; Kupriyanova &amp; Flaxman 2024). Among these species, only two occur in North America: H. biformis (Hartman, 1960) originally described from the Santa Catalina Basin, Southern California, USA, in 1,280 m depth, and H. mironovi Kupriyanova, 1993, a species described from the Kurile-Kamchatka Trench in 5,110 m depth and reported by Bastida-Zavala (2008) to California (USA).</p><p>Tube, operculum and opercular stalk of the specimen here examined match with those of H. biformis described by Hartman (1960), a species with a sinuous tube with a basal part longitudinally ridged, with a high, dorsal keel. The tube of the specimen here reported is incomplete, lacks the basal part, but a longitudinal keel run from the anterior end to the last preserved section. In addition, it has some collar-like shallow rings anteriorly. This constitutes the first record of H. biformis for Mexico.</p><p>Abiotic conditions. The specimen of H.biformis was collected in 195 m deep, under the following environmental conditions. Temperature: 12.7°C; salinity: 34.99; dissolved oxygen: 2.9 ml O 2 /l; %MO: 2.9; sediments dominated by sand (88.6%) (Table 1).</p><p>Distribution. Northern Gulf of California, Mexico.</p><p>Genus Hydroides Gunnerus, 1768</p></div>	https://treatment.plazi.org/id/039E9712FF92FF8FFF65FB42FDFBFDA7	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Tovar-Hernández, María Ana;León-González, Jesús Angel De;Hendrickx, Michel E.	Tovar-Hernández, María Ana, León-González, Jesús Angel De, Hendrickx, Michel E. (2025): Polychaeta collected during the research cruises TALUD aboard the R / V “ El Puma ” in the Mexican Pacific: Sabellidae and Serpulidae. Zootaxa 5663 (1): 1-80, DOI: 10.11646/zootaxa.5663.1.1, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
