Epimeria (Subepimeria) urvillei, 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 : 151-153

Epimeria (Subepimeria) urvillei sp. nov.

urn:lsid:zoobank.org:act:524C2AA7-3B7D-4EDF-B336-0A2D2D5BE294

Figs 314–319

‘Clade B puncticulata complex - PUN3’ – Verheye et al. 2016a, supplement: 3 (online).

Etymology

The species is dedicated to the memory of the French explorer Jules Sébastien César Dumont d’Urville (23 May 1790 – 8 May 1842), who discovered Adélie Coast, where the species was collected. The name is a genitive.

Type material

Holotype

RV Seatruck cruises:

SOUTHERN OCEAN: ovigerous ♀, cruise REVOLTA III, stn. REVO_084, Collect_ID: REVO_477, Field_ID: CE-000003093, Adélie Coast, 66°39.279ʹ S, 139°55.846ʹ E to 66°39.291ʹ S, 139°56.043ʹ E,

52–54 m, beam trawl, 1 Feb. 2012, Coll. G. Lecointre, A. Dettaï, J. Lanshere, C. Gallut and C. Ozouf, ( MNHN-IU-2009-2578 ) [ Extraction K33; Genbank nr, COI: KU870867 , 28S: KU759646 ].

Description

ROSTRUM. In lateral view short and narrow, not reaching tip of article 1 of peduncle of antenna 1, very weakly and regularly curved on anterior border, posterior border very weakly concave, tip acute; in frontal view triangular: fairly narrow, with straight converging borders, with tip blunt.

EYES. Large, narrowly elliptic.

PEREION–PLEOSOME TOOTH PATTERN. Pereionites 1–7 totally smooth; pleonite 1 keeled all along its length, posteriorly terminated by tiny but distinct bump; pleonite 2 keeled with well developed acute posterodorsal tooth; pleonite 3 keeled with posterodorsal tip forming a distinct blunt triangular process distinctly projecting backwards.

COXAE 1–2. Tip subacute.

COXA 4. Fairly narrow; anterodorsal border nearly straight, followed by anterior angle + anteroventral border, which form a very regular curve (without discontinuity) — there is no distinct anterior corner; the coxa is not projecting forward; ventral corner forming an acute (nearly squared) angle of which the tip is subacute; posteroventral border distinctly concave; posterodorsal border 1.2 × as long as posteroventral border.

COXA 5. Very broad, posteroventral corner forming a blunt but distinct obtuse (nearly squared) angle.

COXA 6. Posterior border regularly rounded.

COXA 7. Posterior border straight; posteroventral corner forming a distinct obtuse angle.

EPIMERAL PLATES 1–3. Posteroventral angle broadly rounded in plate 1, produced into a medium-sized tooth in plates 2–3.

UROSOME TOOTH PATTERN. Urosomite 1 with distinct triangular dorsal process, anteriorly weakly concave, tip subacute, posterior border nearly straight (inconspicuously concave); urosomite 3 with dorsolateral borders straight, with tip forming a squared angle.

TELSON. Cleft on 0.25; lobes with tips bluntly angulate; notch narrowly V-shaped.

GNATHOPODS 1–2. With carpus and propodus of normal slenderness; propodus not narrowing distally, and palm distinct but weak.

PEREIOPOD 5. Basis of normal width, with posteroproximal process reduced to low proximal dilatation in continuity with the more distal part of the posterior border, with posterodistal corner forming a long, narrowly triangular sharp tooth projecting backwards; merus, carpus and propodus stout.

PEREIOPOD 6. Basis of normal width, with posteroproximal process indistinct (reduced to very low proximal dilatation in continuity with the more distal part of the posterior border), with posterior border slightly but distinctly diverging from anterior border, with posterodistal corner forming a triangular process (acute, nearly squared angle) weakly projecting backwards; 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 very blunt, obtuse angle.

Colour pattern

Whitish with scattered orange dots. Rostrum, coxae 1–4, anterior 0.2 of coxa 5, pleon suffused with pale orange. Eyes reddish.

Body length

16 mm.

Distribution

Adélie Coast, 52– 54 m.

Remarks

Epimeria urvillei sp. nov. is morphologically very similar to E. teres sp. nov. and E. puncticulata . Further molecular and morphological studies are necessary to sort out completely the taxonomy of this complex.

Figures

Fig. 314. Epimeria (Subepimeria) urvillei sp. nov., ♀, holotype, Adélie Coast, REVO_477, MNHN- IU-2009-2578. A. Lateral habitus, colour in life. B. Lateral habitus C. Dorsal habitus. Colour photograph: Cyril Gallut (MNHN).

Fig. 315. Epimeria (Subepimeria) urvillei sp. nov., ♀, holotype, Adélie Coast, REVO_477, MNHN- IU-2009-2578. A. Facial habitus. B. Head in facial view.

Fig. 316. Epimeria (Subepimeria) urvillei sp. nov., ♀, holotype, Adélie Coast, REVO_477, MNHN- IU-2009-2578. A. Anterior half of body. B. Posterior half of body.

Fig. 317. Epimeria (Subepimeria) urvillei sp. nov., ♀, holotype, Adélie Coast, REVO_477, MNHN- IU-2009-2578. A. Head and body segments 1–3 in lateral view. B. Urosome in dorsal view. C. Telson in dorsal view.

Fig. 318. Epimeria (Subepimeria) urvillei sp. nov., ♀, holotype, Adélie Coast, REVO_477, MNHN- IU-2009-2578. A. Gnathopod 1. B. Gnathopod 2.

Fig. 319. Epimeria (Subepimeria) urvillei sp. nov., ♀, holotype, Adélie Coast, REVO_477, MNHN- IU-2009-2578. A. Pereiopod 4. B. Pereiopod 5. C. Pereiopod 6. D. Pereiopod 7.