Hartmanipsammolyce pettiboneae, Cruz-Gómez, 2022

Cruz-Gómez, Christopher, 2022, Pelogeniinae Chamberlin, 1919 (Annelida, Sigalionidae) from the Grand Caribbean Region, European Journal of Taxonomy 807, pp. 1-59 : 14-18

Hartmanipsammolyce pettiboneae sp. nov.

urn:lsid:zoobank.org:act:B129D523-4BFB-45BB-AADD-70EF1B644E73

Figs 2O–P , 5–6

Diagnosis

A species of Hartmanipsammolyce with an oblong neuropodial lobe on segment III; neurochaetae from median segments with blades with long distal and subdistal teeth; posterior elytra with a medial process and 6–7 medial projections; marginal elytral papillae long and articulated.

Etymology

The species is named after the late Dr Marian H. Pettibone in recognition of her sustained efforts in studying polychaetes during many years, especially regarding the members of Sigalionidae . Her studies are the backbone for this and further contributions. The epithet is a noun in the genitive case ( ICZN 1999, Art. 31.1.2).

Material examined

Holotype MEXICO • incomplete spec.; Quintana Roo, off Cancun; 21°05′ N, 86°23′ W; R/V Pillsbury, Stn 580; depth 351 m; 22 May 1967; UMML 22.1087 .

Description (holotype)

BODY. Orange, long, broad ( Fig. 5A ); 136 segments, 9 cm long, 1.1 cm to segment 30, 1.1 cm wide. Middorsal line covered with white foreign particles attached to adhesive papillae ( Fig. 5D ). Venter only covered with short globular papillae ( Fig. 5E ).

PROSTOMIUM. Oval, wider than long. Two pairs of eyes, anterior eyes larger. Lateral antennae small, slender; ceratophores as long as styles, dorsally fused with tentacular segment. Median antennal ceratophore bulbous, as long as prostomium, with a lateral ridge; basally with ctenidia; style long, as long as ceratophore. Middorsal lobe of segment II subtriangular ( Fig. 5B ). First segment directed anteriorly, fused with tentacular segment; biramous, chaetae simple verticillate. Dorsal tentacular cirrus slightly longer than neuropodia including chaetae, ventral tentacular cirrus slightly shorter than dorsal one; palps laterally displaced, short, reaching segment five, with inner sheaths. Pharynx partially everted ( Fig. 5C ).

ELYTRA. First right elytron oval, with a mid-distal notch, covered with few fragments of shells attached to several kinds of papillae ( Fig. 6E ); elytral surface with pedunculate papillae with flat tips, pedunculate papillae with truncated tips, and pedunculate globular papillae, more abundant in the mid-posterior section; elytral margins with short dendritic papillae and segmented, long dendritic papillae ( Figs 2O–P , 6I, L ). Second right elytron oblong, covered with few fragments of shells and same kinds of papillae ( Fig. 6F ) but sparser, lateral margin with one mid-distal projection ( Fig. 6H ). Third right elytron similar to second one. Posterior elytra subrectangular with papillae only along posterolateral elytral surface ( Fig. 6G, M ), with a large medial process, lateral margin with 6–7 mid-distal projections with segmented, long dendritic papillae ( Fig. 6J–K ).

RIGHT PARAPODIUM FROM SEGMENT II ( Fig. 5F ). Notopodia truncated, papillate, short, half as long as neuropodia. With up to 50 simple verticillate notochaetae, shortest ones as long as notopodia, longest ones 4× as long ( Fig. 5G ). Neuropodia heart-shaped, smooth (non-papillate), larger than notopodia. Neurochaetae only bifid falcigers: unit A, eight falcigers directed upwards with handles slender, with 30–36 transverse rows of spines, blades long, 16 × as long as wide ( Fig. 5H ); unit B, 15 falcigers with handles thick, with 27–34 transverse rows of spines, blades long, 35× as long as wide ( Fig. 5I ); unit D, seven falcigers with handles slender with 15–18 transverse rows of spines, blades medium-sized, 10 × as long as wide ( Fig. 5J ).

RIGHT PARAPODIUM FROM SEGMENT III ( Fig. 5K ). Notopodia heart-shaped, papillate, short, half as long as neuropodia. With up to 80 simple verticillate notochaetae, shortest ones as long as notopodia, longest ones 4× as long ( Fig. 5L ). Neuropodia truncated, smooth (non-papillate), larger than notopodia, with one large oblong distal lobe (twice as long as neuropodia). Neurochaetae only falcigers: unit A, four falcigers with handles thick with 14–15 transverse rows of spines, blades long, 14–16× as long as wide ( Fig. 5O ); unit B, 12 falcigers with handles slender, smooth, blades long, 12 × as long as wide ( Fig. 5M ); unit C and D undifferentiated, 13 falcigers with handles slender, smooth, blades medium-sized, 8–10 × as long as wide ( Fig. 5N ). Unit A with bifid blades, units B and C with falcate blades.

RIGHT PARAPODIUM FROM SEGMENT 81 (MIDDLE SEGMENT) ( Figs 5P , 6A ). Notopodia, truncated, papillate, short, as long as half of neuropodia. With up to 120 simple verticillate notochaetae, shortest ones half as long as notopodia, longest ones 4× as long ( Figs 5Q , 6B ). Neuropodia leaf-shaped, papillate, larger than notopodia. Neurochaetae only bifid falcigers: unit A, nine falcigers with handles thick, with 5–10 transverse rows of spines, blades medium-sized, 8–10× as long as wide ( Figs 5R , 6C ); unit B, two falcigers with handle thick with 5–6 rows of spines, blades lost (in posterior segments, blades mediumsized, 5–6× as long as wide) ( Figs 5S , 6C ); unit C, 13 falcigers with handles thick, with 3–4 transverse rows of spines, blades medium-sized, 5–6 × as long as wide ( Fig. 5T ); subunit 2, four falcigers with handles thick, smooth, blades long, 20× as long as wide ( Fig. 5U ); unit D, eight falcigers with handles slender, with two barely noticeable rows of denticles, blades long, 15–20 × as long as wide ( Figs 5V , 6D ).

POSTERIOR REGION. Lost.

Remarks

Hartmanipsammolyce pettiboneae sp. nov. differs from H. pendula (Hartman, 1942) because in the former the large lobe on the margin of segment III is oblong; the middle segments have neurochaetal blades with long distal and subdistal teeth, even with tips touching each other; the first elytron is short, oval; and the posterior elytra have one large posterior process and 6–7 mid-distal projections with segmented, long dendritic papillae. By contrast, in H. pendula segment III has a balloon-like ( Hartman 1965: 265, pl. 3 fig. a) or drop-like ( Pettibone 1997: 24, fig. 15e) lobe; middle segments have neurochaetal blades with short distal and subdistal teeth ( Hartman 1968: 265, pl. 3 fig. b; Pettibone 1997: 25, fig. 16b); first elytra are enlarged and oblong; and posterior elytra have one large posterior process and no medial processes, with entire, long dendritic papillae.

Distribution

Caribbean Sea. Quintana Roo, Mexico.

Figures

Fig. 2. Elytral microstructures. A–B, E–F, M–N. Dayipsammolyce paulayi sp. nov. C–D, I–J. Pelogenia kinbergi (Hansen, 1882). G–H. Neopsammolyce floccifera (Augener, 1906). K–L. Neopsammolyce aff. floccifera. O–P. Hartmanipsammolyce pettiboneae sp. nov. Q–R. Pelogenia capitata sp. nov. A–H. Non-adherent microestructures. A–B. Microtubercles. C–D. Pedunculate papillae with puffed tips. E–F. Short dendritic papillae. G–H. Long dendritic papillae. I–R. Adherent papillae. I–J. Flat papillae. K–L. Pedunculate papillae with flat tip. M–N. Pedunculate papillae with truncated tips. O–P. Pedunculate globular papillae. Q–R. Pedunculate capitate papillae. Scale bars: A–B, N, Q–R = 10 μm; C–F, I–M, O = 20 μm; G–H = 100 μm; P = 5 μm.

Fig. 5. Hartmanipsamolyce pettiboneae sp. nov., holotype (UMML 22.1087). A. Incomplete worm, dorsal view. B. Anterior end, dorsal view; arrowhead indicates ctenidia; asterisk indicates partially everted pharynx. C. Anterior end, ventral view (close-up in box); asterisk indicates partially everted pharynx. D. Dorsal papillae (close-up in box). E. Ventral papillae (close-up in box). F. Right parapodium from segment II. G. Notochaeta from same. H. Unit A. I. Unit B. J. Units C and D. K. Right parapodium from segment III, arrow indicates neuropodial lobe. L. Notochaeta from same. M. Unit B. N. Units C and D. O. Unit A. P. Right parapodium from segment 81. Q. Notochaeta from same. R. Unit A. S. Unit B. T. Unit C. U. Subunit 2. V. Unit D. Scale bars: A = 1 cm; B–C = 1 mm; D–F, K, P = 500 μm; G, L, Q = 40 μm; H–J, M–O, R–V = 100 μm.

Fig. 6. Hartmanipsammolyce pettiboneae sp. nov., holotype (UMML 22.10887). A–D, K–M. SEM micrographs. A. Right parapodium from segment 30.B. Notochaeta from same.C. UnitsA and B.D. Unit D. E. First right elytron. F. Second right elytron. G. Posterior right elytron. H. Proximal margin of E. I. Posterior margin from E. J. Posterior processes from G. K. Segmented long papillae. L. Pedunculate papilla with flat tip. M. Surface of E. Abbreviations: a = anterior; p = posterior. Scale bars: A = 200 μm; B = 5 μm; C–D, H–K = 50 μm; E–G = 1 mm; L = 10 μm; M = 20 μm.