Epimeria colemani Souza-Filho, Guedes-Silva & Andrade, 2024

Souza-Filho, Jesser F., Guedes-Silva, Elkênita & Andrade, Luiz F., 2024, Four new species and two new records of deep-sea Amphipoda (Crustacea: Peracarida) from Potiguar Basin, north-eastern Brazil, Journal of Natural History 58 (41 - 44), pp. 1615-1655 : 1634-1639

publication ID

https://doi.org/ 10.1080/00222933.2024.2374404

DOI

https://doi.org/10.5281/zenodo.13784996

persistent identifier

https://treatment.plazi.org/id/2A3B87F7-FFBA-FFC3-FEFA-76F8FE91FE7D

treatment provided by

Plazi

scientific name

Epimeria colemani Souza-Filho, Guedes-Silva & Andrade
status

sp. nov.

Epimeria colemani Souza-Filho, Guedes-Silva & Andrade View in CoL sp. n.

( Figures 12–16 View Figure 12 View Figure 13 View Figure 14 View Figure 15 View Figure 16 )

Material examined

Holotype female (ovigerous), 33.8 mm, Potiguar Basin , MT 73–2 , initial trawl coordinates 4.6475°S, 36.5001°W, final trawl coordinates 4.6434°S, 36.4693°W, Rio Grande do Norte state, Brazil, initial depth 955 m, final depth 1006 m, 16 May 2011, R / V Seward Johnson col. ( MOUFPE 15084 View Materials ). GoogleMaps

Type locality

Slope   GoogleMaps of Rio Grande do Norte state, north-eastern Brazil, between 4.6475°S, 36.5001°W and 4.6434°S, 36.4693°W.

Diagnosis

Rostrum evenly curved downwards, as long as peduncle of antenna 1. Pereonite 7 with a short mid-dorsal carina. Coxa 4 elongated, almost 1.5× as long as coxa 3, apex narrow, pointed and curved laterally, posteromarginal excavation shallow. Coxa 5 with narrow spine distally curved upwards. Coxa 6 with pointed process on lateral face. Gnathopods 1–2 palm almost transverse. Pereopods 3–7 dactylus with a nail. Pleon with long pointed carinae, that on pleonite 2 longest. Urosomite 1 with upright pointed process and small hump on urosomite 3. Telson with a shallow notch.

Description

Based on female holotype, 33.8 mm, MOUFPE 15084. Body as in Figure 12 View Figure 12 . Head ( Figure 12a View Figure 12 ) rostrum reaching the apex of peduncular article 3 of antenna 1; eyes subtrapezoidal. Antenna 1 ( Figure 12b View Figure 12 ) peduncle article 1 about 1.7× longer than wide; accessory flagellum 1-articulate. Antenna 2 ( Figure 12c View Figure 12 ) longer than antenna 1, peduncle article 4 about 1.3× longer than article 5; flagellum 44-articulate. Lower lip ( Figure 12d View Figure 12 ) inner and outer margins setose. Mandibles ( Figure 12e View Figure 12 –) incisors with 5 teeth; molar triturative; left lacinia mobilis with 7 teeth; right lacinia mobilis with a smooth ridge and a blunt projection; accessory setal row with many plumose between robust multicuspidate setae; palp 3-articulate, article 2 about 1.3× the length of article 3, article 3 setose. Maxilla 1 ( Figure 12g View Figure 12 ) inner plate with plumose setae; outer plate with 9 robust serrate setae; palp 2-articulate, article 2 apex with 5 acute projections, bearing 4 robust setae. Maxilla 2 ( Figure 12h View Figure 12 ) inner and outer plates setose, with facial setules. Maxilliped ( Figure 12i View Figure 12 ) inner plate with 3 short robust apical setae; outer plate broad, mesial margin with a finely serrate ridge, apically with robust and slender setae; palp article 2 setose, article 4 mesial margin serrate, with an apical nail.

Coxae 1–3 ( Figures 14a–b View Figure 14 , 15a View Figure 15 ) much deeper than wide, increasing in length. Gnathopod 1 ( Figure 14a View Figure 14 ) basis curved, anterior margin setose; merus posterior margin setose, 1.2× longer than propodus; propodus 2.1× longer than wide, posterior margin with groups of slender and robust setae; palm, finely serrate; dactylus longer than palm, serrate, with a nail. Gnathopod 2 ( Figure 14b View Figure 14 ) basis anterior margin setose; carpus slightly longer than propodus; palm finely serrate; dactylus longer than palm, serrate, with a nail. Pereopods 3–4 ( Figure 15a–b View Figure 15 ) similar, slender, merus longer than carpus and propodus. Pereopods 5–6 ( Figure 15c–f View Figure 15 ) similar, slender, weakly setose. Pereopod 7 ( Figure 15f View Figure 15 ) basis 1.8× longer than wide, posterior margin with a strong medial broadening; carpus as long as propodus. Pereonites 1–6 ( Figure 1 View Figure 1 ) dorsally smooth; pereonite 7 ( Figure 16b View Figure 16 ) with a short mid-dorsal subacute tooth. Pleonites 1–3 ( Figure 16c–e View Figure 16 ) strongly carinate, dorsal tooth of pleonite 2 ( Figure 16d View Figure 16 ) longest; pleonites 1–2 ( Figure 16c–d View Figure 16 ) posteroventral corner acutely produced, that of pleonite 3 ( Figure 16e View Figure 16 ) angular. Epimera 1–3 ( Figure 16c– e View Figure 16 ) ventrally rounded, produced. Urosomite 1 ( Figure 16f View Figure 16 ) with a mid-dorsal notch (seen from lateral) and an upright pointed tooth; urosomite 2 ( Figure 16g View Figure 16 ) being the shortest; urosomite 3 ( Figure 16H View Figure 16 ) with a rounded mid-dorsal elevation. Uropod 1 ( Figure 16o View Figure 16 ) peduncle 5.4× longer than wide, with 2 dorsal rows of short robust setae; rami subequal with a continuous row of short robust setae. Uropod 2 ( Figure 16p View Figure 16 ) peduncle 2.5× longer than wide, with dorsal short robust setae; outer ramus short than inner, with marginal short robust setae; inner ramus damaged. Uropod 3 ( Figure 16q View Figure 16 ) peduncle 2.1× longer than wide; rami subequal, lanceolate, with marginal short robust setae. Telson ( Figure 16r View Figure 16 ) subtrapezoidal, with a shallow notch of about 10% the whole length.

Variations

It is important to highlight that the shape of the coxa 5 of the holotype presents a variation on left and right sides. The right coxa 5 ( Figure 15d View Figure 15 ), which is figured on the habitus, shows a higher degree of curvature on its distal part, whereas the left side, although curved, is not as strong.

Etymology

The specific epithet is dedicated to Dr Charles Oliver Coleman, for his great contribution to the taxonomy of amphipods and to the genus Epimeria .

Distribution and bathymetry

Known   GoogleMaps only from the type locality (slope of Rio Grande do Norte state, north-eastern Brazil, 4.6475°S, 36.5001°W and 4.6434°S, 36.4693°W), between 955 and 1006 m deep ( Figure 23 View Figure 23 ).

Remarks

Among the known species of the genus, E. colemani sp. n. is most similar to E. ultraspinosa Wakabara and Serejo, 1999 and E. norfanzi Lörz, 2011 in presenting coxa 5 with a long spiniform process and pleonites 1–3 with well-developed dorsal spiniform process. However, the new species can be distinguished from E. ultraspinosa by the following characters (characters of E. ultraspinosa in parentheses): mandible palp article 2 about 1.3× longer than article 3 (slightly longer); pereonites 6–7 with a dorsal process (without process); coxa 4 posterior lobe blunt (acute); coxa 5 measurement from anterior margin to distal end of spiniform process 1.8× longer than basis length (2.9× longer), distally curved upwards (straight); gnathopod 1 palm almost transverse (acute); uropods 1–2 rami not reaching the apex of uropod 3 rami (reaching the apex). Epimeria colemani sp. n. also differs from E. norfanzi by the following (characters of E. norfanzi in parentheses): rostrum directed downward and reaching the end of peduncle article 3 of antenna 1 (directed straight forward and reaching the end of peduncle article 1); coxae 1–3 ventral corner acute (blunt); coxa 5 spiniform process broad, curved upwards (thin, curved downwards); pleonite 3 dorsal process large, projecting distally (short, projecting medially), telson notched (entire).

R

Departamento de Geologia, Universidad de Chile

V

Royal British Columbia Museum - Herbarium

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Epimeriidae

Genus

Epimeria

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF