Epimeria (Drakepimeria) corbariae d'Acoz & Verheye 2017, sp. nov

Autor: d'Acoz, C��dric d'Udekem, Verheye, Marie L.
Rok vydání: 2017
Předmět:
DOI: 10.5281/zenodo.3857696
Popis: Epimeria (Drakepimeria) corbariae sp. nov. urn:lsid:zoobank.org:act: 74519DD0-1C75-4392-AA0D-5FB811B108F4 Figs 27���43 Epimeria macrodonta ���? Chilton 1912: 486. ���Clade A similis / macrodonta complex - MA2�� ��� Verheye et al. 2016a, supplement: 2 (online). non Epimeria macrodonta Walker, 1906: 16. Etymology The species is dedicated to Laure Corbari (Mus��um national d���Histoire naturelle, Paris), who gave us the opportunity to study the very interesting collections of the CEAMARC and REVOLTA expeditions. The name is a genitive. Type material Holotype REVOLTA cruises: (RV Seatruck) SOUTHERN OCEAN: 1 ♀, cruise REVOLTA I, stn REVO-007b, Collect_ ID: 249, Field_ ID: CE- 000004589, Ad��lie Coast, 66��38��25��� S, 139��49��43��� E, 127���133 m, 22 Jan. 2010, coll. M. El��aume, L. Hemery and A. D���Hont, (MNHN-IU- 2009-2570) [extraction K 4; Genbank nr, COI: KU 870872, 28 S: KU 759652]. Paratypes RV Aurora Australis cruises: SOUTHERN OCEAN: 3 specs, cruise CEAMARC, sample CEAMARC 933, stn 40EV152, Ad��lie Coast, 66��39��38��� S, 143��01��16��� E, 471���637 m, beam trawl, 28 Dec. 2007, coll. IPEV-AAD-MNHN (MNHN-IU-2014-4283); 1 ♀, cruise CEAMARC, sample CEAMARC 1643, stn 31EV268,Ad��lie Coast, 66��34��30��� S, 145��01��15��� E, 429���451 m, beam trawl, 3 Jan. 2008, coll. IPEV-AAD-MNHN (MNHN- IU-2014-7326, removed from MNHN-IU-2014-4322); 5 specs, cruise CEAMARC, sample CEAMARC 2072, stn 65EV322, Ad��lie Coast, 65��48��29��� S, 143��03��46��� E, 750���788 m, beam trawl, 5 Jan. 2008, coll. IPEV-AAD-MNHN (MNHN-IU-2014-4286); 1 ♀, cruise CEAMARC, sample CEAMARC 2724, stn 71EV447, Ad��lie Coast, 66��24��00��� S, 140��32��21��� E, 683���791 m, v 14 Jan. 2008, coll. IPEV-AAD- MNHN (MNHN-IU-2014-7327, removed from MNHN-IU-2014-4337); 6 specs, cruise CEAMARC, sample CEAMARC 3978, stn 36EV297, Ad��lie Coast, 66��20��20��� S, 143��41��08��� E, 552���573 m, beam trawl, 4 Jan. 2008, coll. IPEV-AAD-MNHN (MNHN-IU-2014-4330); 1 spec., cruise REVOLTA II, stn REVO_133, Collect_ ID: REVO_133, Ad��lie Coast, 66��37��04��� S, 140��00��13��� E, 103���107 m, 11 Jan. 2011, coll. N. Am��ziane, N. Bax, C. Gallut, A. C. Lautr��dou and C. Robineau (MNHN-IU-2014-4297); 1 ovigerous ♀, cruise REVOLTA II, stn REVO_091, Collect_ ID: REVO_162, Field_ ID: CE-000001166, Ad��lie Coast, 66��41��07��� S, 139��56��41��� E, 33���34 m, 19 Jan. 2011, coll. N. Am��ziane, N. Bax, C. Gallut, A. C. Lautr��dou and C. Robineau (MNHN-IU-2014-7325, removed from MNHN- 2014-4299) [extraction M 10; Genbank nr, COI: KU 870878, 28 S: KU 759661]; 1 spec., cruise REVOLTA II, stn REVO_091, Collect_ ID: REVO_162, Field_ ID: CE-000001166, 66��41��07��� S, 139��56��41��� E, 33���34 m, 19 Jan. 2011, coll. N. Am��ziane, (MNHN-IU-2014-4299); 1 spec., cruise REVOLTA II, stn REVO_091, Collect_ ID: REVO_162, Ad��lie Coast, 66��41��07��� S, 139��56��41��� E, 33���34 m, 19 Jan. 2011, coll. N. Am��ziane, N. Bax, C. Gallut, A. C. Lautr��dou and C. Robineau (MNHN-IU-2014-4298); 1 juv., cruise REVOLTA II, stn REVO_085, Collect_ ID: REVO_191, Field_ ID: CE-000001559, 66��40��12��� S, 139��55��56��� E, Ad��lie Coast, 37���44 m, 29 Jan. 2011, coll. N. Am��ziane, N. Bax, C. Gallut, A. C. Lautr��dou and C. Robineau, (MNHN-IU-2014-4296) [extraction M 11; Genbank nr, 28 S: KU 759662]; 1 spec., cruise REVOLTA II, stn REVO_037, Collect_ ID: REVO_209, Ad��lie Coast, 66��39��13��� S, 139��52��04��� E, 105���107 m, 1 Feb. 2011, coll. N. Am��ziane, N. Bax, C. Gallut, A. C. Lautr��dou and C. Robineau (MNHN-IU-2014-4305); 2 specs, cruise REVOLTA II, stn REVO_037, Collect_ ID: REVO_209, Ad��lie Coast, 66��39��13��� S, 139��52��04��� E, 105���107 m, 1 Feb. 2011, coll. N. Am��ziane, N. Bax, C. Gallut, A. C. Lautr��dou and C. Robineau (RBINS 132717, formerly MNHN-IU-2014-4305); 1 spec., cruise REVOLTA III, stn REVO_039, Collect_ ID: REVO_464, Ad��lie Coast, 66��38.370�� S, 139��55.863�� E to 66��38.406�� S, 139��56.030�� E, 100 m, beam trawl, 30 Jan. 2012, coll. G. Lecointre, A. Detta��, J. Lanshere, C. Gallut and C. Ozouf (MNHN number-IU- 2009-2542); 1 juv., cruise REVOLTA III, stn REVO_040, Collect_ ID: REVO_470, Ad��lie Coast, 66��38.50�� S, 139��57.02�� E to 66��38.41�� S, 139��57.14�� W, 98���100 m, beam trawl, 31 Jan. 2012, coll. G. Lecointre, A. Detta��, J. Lanshere, C. Gallut and C. Ozouf (MNHN- IU- 2009-2551); 1 small spec., cruise REVOLTA III, stn REVO_064, Collect_ ID: REVO_481, Ad��lie Coast, 66��36.371�� S, 140��05.075�� E to 66��36.394�� S, 140��04.966�� E, 110���120 m, beam trawl, 3 Jan. 2012, coll. G. Lecointre, A. Detta��, J. Lanshere, C. Gallut and C. Ozouf (MNHN-IU- 2009-2562); 1 adult spec., cruise REVOLTA III, stn REVO_068, Collect_ ID: REVO_493, Field_ ID: CE-000002621, Ad��lie Coast, 66��35��18��� S, 140��03��15��� E to 66��35��22��� S, 140003��23��� E, 57���118 m, beam trawl, 7 Feb. 2012, coll. G. Lecointre, A. Detta��, J. Lanshere, C. Gallut and C. Ozouf (MNHN-IU- 2009-2581). RV L���Astrolabe cruises: 5 specs, cruise REVOLTA III, stn none (Dumont d���Urville sea), Collect_ ID: REVO _449, Field_ ID: CE-000002109 Ad��lie Coast, 66��38�� S, 140��42�� E to 66��38�� S, 140��40�� E, 718���729 m, mud, beam trawl, 20 Jan. 2012, coll. G. Lecointre, A. Detta��, J. Lanshere, C. Gallut and C. Ozouf (MNHN-IU- 2009-2543); 1 ♀, cruise REVOLTA III, stn REVO_064, Collect_ ID: REVO _481, Field_ ID: CE-000003196, Ad��lie Coast, 66��36.371�� S, 140��05.075�� E to 66��36.394�� S, 140��04.966�� E, 110���120 m, beam trawl, 3 Feb. 2012, coll. G. Lecointre, A. Detta��, J. Lanshere, C. Gallut and C. Ozouf (MNHN-IU- 2009-2563) [extraction K 5; Genbank nr, COI: KU 870876, 28 S: KU 759657]. Description ROSTRUM. Long, reaching base of article 2 of peduncle of antenna 1 (teeth excluded), very strongly curved, sharp-tipped in lateral view. EYE. Large, broadly elliptic. PEREION���PLEOSOME TOOTH PATTERN. Pereionite 1 usually without mid-dorsal tooth or with a posterior bump, rarely with small subacute tooth pointing upwards (tooth with anterior border oblique and posterior border vertical), without pair of dorsolateral protrusions when pereionite has no mid-dorsal tooth or only a posterior bump, with pair of low protrusions when mid-dorsal tooth present; pereionite 2 much narrower than pereionites 1 and 3, without mid-dorsal tooth and without pair of dorsolateral teeth; pereionite 3 with medium-sized, broad, subacute to acute tooth pointing upwards or slightly backwards and pair of low and blunt, conical, dorsolateral teeth; pereionite 4 to pleonite 2 with large, narrow to fairly narrow, acute mid-dorsal tooth, of which the anterior border is regularly curved or curved with very faint angular discontinuity and the posterior border is slightly concave, with pair of conical dorsolateral teeth of which the size gradually increases posteriorly (these pairs of teeth are never duplicate); pleonite 3 with large nearly styliform acute-tipped symmetrical mid-dorsal tooth, and pair of large narrowly conical dorsolateral teeth (size of mid-dorsal teeth weakly increasing from pereionite 4 to pleonite 2; mid-dorsal tooth of pleonite 3 slightly but distinctly shorter than tooth of pleonite 2). COXAE 1���3. Strongly carinate and distally sharp. COXA 4. Anterodorsal border straight, anteroventral border distally slightly curved, these two borders being joined by a fairly short blunt angular discontinuity (anterior angle), this anterior angle is weakly projecting forward; ventral tooth long and acute; lateral carina with small tooth pointing backwards (its anterior border is parallel to body axis or nearly so; in dorsal view this tooth form a narrow V-shaped notch with the coxa); carina fairly distant from margin of coxa at its deepest point. COXA 5. With long, sharp, narrowly triangular, carinate, lateral tooth pointing backwards (its anterior margin is distinctly oblique to nearly parallel to body axis and its posterior margin is oblique. COXA 6. With mid-sized, sharp and triangular, carinate, lateral tooth pointing obliquely backwards; its anterior border is distinctly convex); posteroventral corner broadly rounded. COXA 7. With ventral border slightly curved, with posterior border straight or very weakly concave, their convergence forming a sharp squared angle. EPIMERAL PLATES 1���3. Posteroventral angle produced into a very long and very sharp tooth. UROSOME TOOTH PATTERN. Urosomite 1 with large and sharp narrow tooth pointing upwards; urosomite 2 with pair of mid-sized posterior dorsolateral teeth pointing upwards; urosomite 3 with pair of mid-sized posterior dorsolateral teeth pointing obliquely upwards. TELSON. Cleft on 0.45���0.55; tips of lobes subacute, notch narrowly U-shaped. PEDUNCLE OF ANTENNA 1. Article 1 with long lateral and medial teeth reaching mid of article 2 (teeth excluded) and long ventral tooth distinctly overreaching tip of article 2 (teeth excluded); article 2 with large lateral tooth of which 0.3 is overreaching tip of article 3, and huge medial teeth of which 0.6 is overreaching tip of article 3, without ventral tooth; article 3 with medium-sized ventral tooth, about 0.3 times as long as article itself. GNATHOPODS 1���2. Carpus and propodus of normal slenderness; very slightly broadening distally, palm distinct. PEREIOPODS 5���7. Merus, carpus and propodus slender; basis of pereiopods 5���6 of normal width, with posteroproximal process rounded and strongly protruding, with posterodistal tooth very strong (as long as basis width); basis of pereiopod 7 broad with posterodistal tooth acute and large, followed more proximally by distinct concavity, directed posteriorly. Colour pattern Homogeneously bright red, or red marks on a whitish or pale reddish background. Body length Up to 31 mm. Distribution Ad��lie Coast, 33��� 827 m. Remarks Epimeria corbariae sp. nov. exhibits variation in the dentition of the first body segment and the robustness of the mid-dorsal teeth (see figs 27, 28, 34, 38). The angle of divergence of the lateral tooth of coxa 5 with body axis is also variable. Due to these variations, the most extreme forms of E. corbariae sp. nov. were initially interpreted as two separate species. However, genetic data (COI, 28S) suggest that they are indeed conspecific (Fig. 342). Epimeria corbariae sp. nov. (Ad��lie Coast) is morphologically similar to E. anguloce sp. nov. (Weddell Sea and Bransfield Strait), but molecular analyses based on the 28S gene suggest that they are distinct species (Fig. 342). The following morphological differences were observed. In E. corbariae sp. nov., pereionite 1 is usually smooth or with a posterior bump (rarely with a small tooth); in E. anguloce sp. nov. a small tooth is always present. In E. corbariae sp. nov. the mid-dorsal tooth of pereionite 3 to pleonite 2 are a bit shorter and a bit broader than in E. anguloce sp. nov. and those of pereionite 3 to pleonite 2 have a trace of anterior angular discontinuity, which is not present in E. anguloce sp. nov. The tooth of the lateral carina of coxa 4 is more posteriorly directed in E. corbariae sp. nov. and forms a narrower notch with the coxa (when examined in dorsal view) than in E. anguloce sp. nov. The junction between the ventral and the posterior border of coxa 7 forms a sharp squared angle in E. corbariae sp. nov. vs a blunt squared angle in E. anguloce sp. nov., this difference being very clear. In E. corbariae sp. nov., the posterodistal tooth of basis of pereiopod 7 is shorter than in E. anguloce sp. nov. Epimeria corbariae sp. nov. is also very similar to E. schiaparelli, but the middorsal ornamentation of pereionite 3 is much more developed in the first species.
Published as part of d'Acoz, C��dric d'Udekem & Verheye, Marie L., 2017, Epimeria of the Southern Ocean with notes on their relatives (Crustacea, Amphipoda, Eusiroidea), pp. 1-553 in European Journal of Taxonomy 359 on pages 33-36, DOI: 10.5852/ejt.2017.359, http://zenodo.org/record/3855694
{"references":["Chilton C. 1912. The Amphipoda of the Scottish National Antarctic Expedition. Transactions of the Royal Society of Edinburgh 48 (3): 455 - 520, pls 1 - 2. http: // biodiversitylibrary. org / page / 41769498 [accessed 27 Sep. 2016].","Verheye M., Backeljau T. & d'Udekem d'Acoz C. 2016 a. Looking beneath the tip of the iceberg: diversification of the genus Epimeria on the Antarctic shelf (Crustacea, Amphipoda). In: Gutt J., David B. & Isla E. (eds) High environmental variability and steep biological gradients in the waters off the northern Antarctic Peninsula. Polar Biology 39 (5): 925 - 945, online supplementary material https: // doi. org / 10.1007 / s 00300 - 016 - 1910 - 5","Walker A. O. 1906. Preliminary descriptions of new species of Amphipoda from the ' Discovery' Antarctic Expedition, 1902 - 1904. Annals and Magazine of Natural History, Series 7 18: 13 - 18. http: // biodiversitylibrary. org / page / 19366255 [accessed 27 Sep. 2016]."]}
Databáze: OpenAIRE
Externí odkaz: