Epimeria (Subepimeria) adeliae, d’Acoz & Verheye, 2017

d’Acoz, Cédric d’Udekem & Verheye, Marie L., 2017, Epimeria of the Southern Ocean with notes on their relatives (Crustacea, Amphipoda, Eusiroidea), European Journal of Taxonomy 359, pp. 1-553 : 141-142

Epimeria (Subepimeria) adeliae sp. nov.

urn:lsid:zoobank.org:act:76F9695C-487B-434F-B09C-52CA334ACD5B

Figs 294–298

‘ Clade B puncticulata complex - PUN4’ – Verheye et al. 2016a, supplement: 3 (online).

Etymology

The noun Adelia , -ae is a Latinization of Adèle (referring to Adèle Pépin, the wife of Jules Sébastien César Dumont d’Urville), and alludes to Adélie Coast (discovered by J.S.C. Dumont d’Urville), where the type material of the species was collected. The name is a genitive.

Type material

Holotype

RV Aurora Australis cruises:

SOUTHERN OCEAN: ♀, cruise CEAMARC, sample CEAMARC 2072, stn 65EV322, Adélie Coast, 65°48ʹ09″ S, 143°03ʹ46″ E, 750–788 m, beam trawl, 5 Jan. 2008, coll. IPEV-AAD-MNHN ( MNHN- IU-2014-4288 ) [extraction M4; Genbank nr, COI: KU870888 , 28S: KU759671 ].

Paratypes

RV Aurora Australis cruises:

SOUTHERN OCEAN: 1 spec., cruise CEAMARC, sample CEAMARC 2072, stn 65EV322, Adélie Coast, 65°48ʹ09″ S, 143°03ʹ46″ E, 750–788 m, beam trawl, 5 Jan. 2008, coll. IPEV-AAD-MNHN (MNHN-IU-2014-7339, removed from MNHN-IU-2014-4288); 1 spec., cruise CEAMARC, sample CEAMARC 2072, stn 65EV322, Adélie Coast, 65°48ʹ09″ S, 143°03ʹ46″ E, 750–788 m, beam trawl, 5 Jan. 2008, coll. IPEV-AAD-MNHN (MNHN-IU-2014-7340, removed from MNHN-IU-2014-4288) [extraction M3; Genbank nr, 28S: KU759670 ].

Description

ROSTRUM. In lateral view short and narrow, nearly reaching tip of article 1 of peduncle of antenna 1, distinctly curved on the proximal half of its anterior border, posterior border straight, tip acute; in frontal view triangular: fairly broad and with straight converging borders, with tip blunt.

EYES. Large, broadly elliptic.

PEREION–PLEOSOME TOOTH PATTERN. Pereionites 1–6 totally smooth; pereionite 7 keeled with small blunt posterodorsal tooth; pleonites 1–2 keeled with well developed acute posterodorsal tooth; pleonite 3 keeled with posterodorsal tip forming a distinct squared angle.

COXAE 1–3. Tip blunt but narrow.

COXA 4. Of medium width; anterodorsal border proximally nearly straight, curving ventrally and followed by curved anteroventral border (transition between anterodorsal and anteroventral border very gradual, without distinct anterior corner); the coxa is not projecting forward; ventral corner forming a squared angle of which the tip is blunt but not rounded; posteroventral border nearly straight (very weakly concave); posterodorsal border as long as posteroventral border.

COXA 5. Very broad, posteroventral corner forming a blunt but distinct angle.

COXA 6. Posterior border regularly rounded.

COXA 7. Posterior border nearly straight (very weakly convex); posteroventral corner broadly rounded.

EPIMERAL PLATES 1–3. Posteroventral angle blunt and squared in plate 1, produced into a medium-sized tooth in plate 2, into a large tooth in plate 3.

UROSOME TOOTH PATTERN. Urosomite 1 with distinct triangular dorsal process, anteriorly weakly concave, tip subacute, posterior border weakly convex.

TELSON. Cleft on 0.4; lobes with tips bluntly angulate; notch narrowly V-shaped.

GNATHOPODS 1–2. Carpus and propodus of normal slenderness; propodus not narrowing distally, and palm distinct.

PEREIOPOD 5. Basis of normal width, with posteroproximal process forming a low but distinct rounded lobe, with posterodistal corner forming a long, narrowly triangular blunt-tipped tooth; merus, carpus and propodus stout.

PEREIOPOD 6. Basis of normal width, with posteroproximal process very low and rounded, posterior border nearly straight, diverging from anterior border and terminated in blunt squared angle; merus, carpus and propodus stout.

PEREIOPOD 7. Basis broad; posterior border weakly convex, with inconspicuous trace of concavity in distal 0.9, terminated into a blunt, obtuse (nearly squared) angle.

Body length

Up to 16 mm.

Distribution

Adélie Coast, 750– 788 m.

Remarks

The pattern of dorsal teeth of Epimeria adeliae sp. nov. is reminiscent to that of E. ( Subepimeria ) sp. 1 from South Georgia and different from that of other species of the subgenus Subepimeria .

Figures

Fig. 294. Epimeria (Subepimeria) adeliae sp. nov., ♀, holotype, Adélie Coast, CEAMARC 2072, MNHN-IU-2014-4288. A. Lateral habitus. B. Urosome in dorsal view.

Fig. 295. Epimeria (Subepimeria) adeliae sp. nov., ♀, holotype, Adélie Coast, CEAMARC 2072, MNHN-IU-2014-4288. A. Facial habitus. B. Head in facial view.

Fig. 296. Epimeria (Subepimeria) adeliae sp. nov., ♀, holotype, Adélie Coast, CEAMARC 2072, MNHN-IU-2014-4288. A. Anterior half in lateral view. B. Posterior half in lateral view.

Fig. 297. Epimeria (Subepimeria) adeliae sp. nov., ♀, holotype, Adélie Coast, CEAMARC 2072, MNHN-IU-2014-4288. A. Gnathopod 1. B. Tip of Gn1. C. Gnathopod 2. D. Tip of Gn2. E. Pereiopod 4.

Fig. 298. Epimeria (Subepimeria) adeliae sp. nov., ♀, holotype, Adélie Coast, CEAMARC 2072, MNHN-IU-2014-4288. A. Pereiopod 5. B. Pereiopod 6. C. Pereiopod 7.