Epimeria (Drakepimeria) havermansiana, 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 : 38-40

Epimeria (Drakepimeria) havermansiana subgen. et sp. nov.

urn:lsid:zoobank.org:act:A9A0D4D2-5D0E-4E40-A553-94013735FC7F

Figs 51–57

‘Clade A similis / macrodonta complex - SI1’ – Verheye et al. 2016 a, supplement: 2 (online).

Etymology

The species is dedicated to Charlotte Havermans (formerly RBINS, currently Alfred-Wegener-Institute Helmholtz-Zentrum für Polar- und Meeresforschung), who collected the holotype of the species. Havermansiana is the feminine of havermansianus, which is a Latin adjective of the second declension derived from her name.

Type material

Holotype

RV Polarstern cruises:

SOUTHERN OCEAN : 1 spec., sex undetermined, cruise PS77, ANT-XXVII/3, CAMBIO, stn 300-1, eastern Weddell Sea , BENDEX area, 70°50.99ʹ S, 10°35.23ʹ W to 70°50.34ʹ S, 10°34.92ʹ W, 227–266 m, bottom trawl, 1 Apr. 2011, ( RBINS, INV. 132964) [extraction I12; Genbank nr, 28S: KU759614 ].

Paratypes

RV Polarstern cruises:

SOUTHERN OCEAN : 1 spec., cruise PS39, ANT-XIII/3, EASIZ I, stn 1, GSN 1, eastern Weddell Sea , 71°03.10ʹ S, 11°25.50ʹ W, to 71°02.10ʹ S, 11°19.30ʹ W, 462–481 m, bottom trawl, 5 Feb. 1996, specimen kept in aquarium on board, coll. C. De Broyer and G. Chapelle ( RBINS, INV. 132700); 1 spec., cruise PS39, ANT-XIII/3, EASIZ I, stn 17, GSN 10, eastern Weddell Sea , 73°18.00ʹ S, 21°09.90ʹ W, to 73°19.10ʹ S, 21°14.90ʹ W, 465–468 m, bottom trawl, 16 Feb. 1996, coll. C. De Broyer and G. Chapelle ( RBINS, INV. 132694).

RV Aurora Australis cruises:

SOUTHERN OCEAN: 3 specs, cruise CEAMARC, sample CEAMARC 3226, stn 20EV490, Adélie Coast, 66°00ʹ59″ S, 140°00ʹ02″ E, 189–196 m, beam trawl, 15 Jan. 2008, coll. IPEV-AAD-MNHN (MNHN-IU- 2014 -4347); 1 spec., cruise CEAMARC, sample CEAMARC 3978, stn 36EV297, Adélie Coast, 66°20ʹ20″ S, 143°41ʹ08″ E, 552–573 m, beam trawl, 4 Jan. 2008 (MNHN-IU- 2014 -7328n, removed from MNHN-IU- 2014 -4329).

RV Marion Dufresne cruises:

SOUTHERN OCEAN: 3 specs (2 large specs and 1 juv.) cruise MD 42 ( SIBEX), stn 22- CP 73, Prydz Bay, 66°57ʹ25″ S, 72°41ʹ25″ E, depth missing [Google Earth depth for that position: 540 m (accessed 27 Sep. 2016)], 26 Jan. 1985 (MNHN-IU- 2014 -4260); 1 ♀, cruise MD 42 (SIBEX), stn 22- CP 71, Prydz Bay, 66°57ʹ37″ S, 72°52ʹ07″ E, depth missing [Google Earth depth for that position: 513 m (accessed 27 Sep. 2016)], 26 Jan. 1985 (MNHN-IU- 2014 -4268).

Belgian and Belgian-Dutch Antarctic expedition:

SOUTHERN OCEAN: 9 specs, Princess Ragnhild Coast, stn 219, Baie du Glacier, 70°18ʹ05″ S, 23°58ʹ00″ E, 216 m, trawl, 31 Jan. 1965 ( RBINS, INV. 132743); 10 specs, Princess Ragnhild Coast, stn 219, Baie du Glacier, 70°18ʹ05″ S, 23°58ʹ00″ E, 216 m, trawl, 31 Jan. 1965, coll. A. Capart ( RBINS, INV. 132744); 1 spec., Princess Ragnhild Coast, stn 219, Baie du Glacier, 70°18ʹ05″ S, 23°58ʹ00″ E, 216 m, trawl, 31 Jan. 1965 ( RBINS, INV. 132747); 1 spec., Princess Ragnhild Coast, stn 219, Baie du Glacier, 70°18ʹ05″ S, 23°58ʹ00″ E, 216 m, trawl, 31 Jan. 1965 ( RBINS, INV. 132750); 2 specs, Princess Ragnhild Coast, stn 220, Baie du Glacier, exact coordinates unavailable [presumably about 70°18ʹ S, 23°58ʹ E], 414–450 m, 1 Feb. 1965, trawl, coll. A. Capart ( RBINS, INV. 132733); 1 spec., Princess Ragnhild Coast, stn 220, Baie du Glacier, exact coordinates unavailable [presumably about 70°18ʹ S, 23°58ʹ E], 414–450 m, 1 Feb. 1965, trawl, coll. A. Capart ( RBINS, INV. 132735); 1 spec., Princess Ragnhild Coast, stn 220, Baie du Glacier, exact coordinates unavailable [presumably about 70°18ʹ S, 23°58ʹ E], 414–450 m, 1 Feb. 1965, trawl, coll. A. Capart ( RBINS, INV. 132736); 1 spec., Princess Ragnhild Coast, stn 220, Baie du Glacier, exact coordinates unavailable [presumably about 70°18ʹ S, 23°58ʹ E], 414–450 m, 1 Feb. 1965, trawl, coll. A. Capart ( RBINS, INV. 132751).

Description

ROSTRUM. Long, reaching about tip of article 1 of peduncle of antenna 1 (teeth excluded), moderately curved, sharp-tipped in lateral view.

EYE. Very large, broadly elliptic (nearly circular).

PEREION–PLEOSOME TOOTH PATTERN. Pereionite 1 with indistinct posterior bump, with pair of low noncarinate dorsolateral swellings; pereionite 2 slightly narrower than pereionite 1, with small but distinct blunt mid-dorsal tooth and pair of low dorsolateral swellings; pereionite 3 with medium-sized blunttipped mid-dorsal tooth and pair of well-developed dorsolateral blunt teeth; pereionite 4 to pereionite 7 with large, broad, regularly curved, acute-tipped mid-dorsal tooth (dorsal length of teeth slightly and gradually increasing posteriorly) and pair of well developed conical dorsolateral teeth (pleonites 1–2 without second pair of dorsolateral teeth); pleonite 3 with dorsal sharp carina with weak median notch and produced posteriorly into an a broad acute and sharp triangular tooth, and pair of fairly large dorsolateral non-carinate acute-tipped teeth.

COXAE 1–3. Strongly carinate and distally sharp.

COXA 4. Anterodorsal + anteroventral borders forming a curve projecting forward (anterodorsal and anteroventral borders becoming straight respectively only at their upper and lower extremities); ventral tooth very sharp and very long; lateral carina without tooth, without distinct angularity, carina very distant from margin of coxa at its deepest point.

COXA 5. With sharp and narrowly triangular carinate, lateral tooth pointing backwards (its lateral border is nearly parallel to body axis or weakly divergent).

COXA 6. With mid-sized, sharp, triangular, carinate, lateral tooth pointing obliquely backwards; posteroventral corner bluntly angular.

COXA 7. With ventral and posterior border straight, converging to form a sharp acute, nearly squared angle.

EPIMERAL PLATES 1–3. Posteroventral angle produced into a very long sharp tooth.

UROSOME TOOTH PATTERN. Urosomite 1 with strong triangular process pointing upwards; urosomite 2 with pair of small sharp posterior dorsolateral teeth pointing upwards.

TELSON. Cleft on 0.25; tips of lobes sharp, broadly V-shaped.

PEDUNCLE OF ANTENNA 1. Article 1 with long lateral and medial teeth reaching beyond mid and nearly mid of article 2 (teeth excluded) and long ventral tooth nearly reaching tip of article 2 (teeth excluded); article 2 with very long lateral and medial teeth overreaching tip of article 3, with ventral tooth slightly overreaching tip of article 3 (tooth excluded); article 3 with long ventral tooth, about as long as article itself.

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

PEREIOPODS 5–7. Merus, carpus and propodus fairly slender; basis of pereiopods 5–6 of normal width, with posteroproximal process rounded and strongly protruding, with posterodistal tooth strong; basis of pereiopod 7 very broad with posterodistal tooth angulate, followed more proximally by small concavity, directed posteriorly.

Body length

Up to 33 mm.

Distribution

Eastern shelf of the Weddell Sea, Princess Ragnhild Coast, Prydz Bay, Adélie Coast; 189– 573 m.

Remarks

Epimeria havermansiana sp. nov. is morphologically very similar to E. pandora sp. nov., but delimitation methods based on the 28S phylogeny indicate that they are indeed distinct species ( Verheye et al. 2016 a, and this paper Fig. 342 ). On pereionite 1, E. havermansiana sp. nov. may have a trace of posterior middorsal bump, which is absent in E. pandora sp. nov. On pereionite 2, E. havermansiana sp. nov. has a posterior tooth, while E. pandora sp. nov. has only a slight bump. In E. havermansiana sp. nov., the dorsolateral teeth of the pereion pleosome and urosomite 2 are larger than in E. pandora sp. nov. Coxa 4 is anteriorly more curved than in E. pandora sp. nov. and its ventral tooth is longer and narrower.

Figures

Fig. 51. Epimeria (Drakepimeria) havermansiana subgen. et sp. nov., sex undetermined, eastern Weddell Sea, ANT-XXVII/3, stn 300-1, RBINS, INV. 132964. A. Lateral habitus. B. Dorsal habitus.

Fig. 52. Epimeria (Drakepimeria) havermansiana subgen. et sp. nov., holotype, sex undetermined, eastern Weddell Sea, ANT-XXVII/3, stn 300-1, RBINS, INV. 132964. A. Head in dorsal view. B. Head in facial view, peduncle of antennae.

Fig. 53. Epimeria (Drakepimeria) havermansiana subgen. et sp. nov., holotype, sex undetermined, eastern Weddell Sea, ANT-XXVII/3, stn 300-1, RBINS, INV. 132964. A. Coxae 1–7. B. Pleonites 2–3, urosome.

Fig. 54. Epimeria (Drakepimeria) havermansiana subgen.et sp. nov., holotype, sex undetermined, eastern Weddell Sea, ANT-XXVII/3, stn 300-1, RBINS, INV. 132964. A. Head in lateral view. B. Urosome in dorsal view. C. Telson.

Fig. 55. Epimeria (Drakepimeria) havermansiana subgen. et sp. nov., holotype, sex undetermined, eastern Weddell Sea, ANT-XXVII/3, stn 300-1, RBINS, INV. 132964. A. Gnathopod 1. B. Gnathopod 2.

Fig. 56. Epimeria (Drakepimeria) havermansiana subgen. et sp. nov., holotype, sex undetermined, eastern Weddell Sea, ANT-XXVII/3, stn 300-1, RBINS, INV. 132964. A. Pereiopod 4. B. Pereiopod 5. C. Pereiopod 6. D. Pereiopod 7.

Fig. 57. Epimeria (Drakepimeria) havermansiana subgen. et sp. nov., adult ♀, Prydz Bay, MD42, stn 22, CP71, MNHN-IU-2014-4268. A. Lateral habitus. B. Dorsal habitus.

Fig. 342. Phylogenetic tree obtained by Bayesian analysis of the concatenated COI and 28S sequences, updated from Verheye et al. (2016). Bayesian posterior probabilities and bootstrap values (from the Maximum Likelihood analysis) are indicated above the nodes of interest. Bootstrap values inferior to 50 are not indicated. Besides the species names are indicated the MOTUs codes used in Verheye et al. (2016). The Genbank accession number of the outgroup species: Gnathiphimedia sexdentata (Schellenberg, 1926) are KU870835 (COI) and KU759609 (28S).