Epimeria (Drakepimeria) robertiana d'Acoz & Verheye 2017, subgen. et sp. nov.
- 1. Royal Belgian Institute of Natural Sciences, Service Heritage, Rue Vautier 29, B- 1000 Brussels, Belgium. & Corresponding author: cdudekem @ naturalsciences. be
- 2. Royal Belgian Institute of Natural Sciences, Operational direction Taxonomy and Phylogeny, Rue Vautier 29, B- 1000 Brussels, Belgium. & Email: mverheye @ naturalsciences. be
Description
Epimeria (Drakepimeria) robertiana subgen. et sp. nov.
urn:lsid:zoobank.org:act: 8433E457-9757-41B0-BC19-2A95EE5E3176
Figs 99–105
Epimeria reoproi – Coleman 2007: in part, only plate 2 fig. h, not p. 49, not fig. 6, not map 13. — Lörz & Coleman 2009: unnumbered photograph on p. 17. — Rauschert & Arntz 2015: 62, pl. 55, unnumbered photograph.
‘ Clade A similis / macrodonta complex - SP2ʹ – Verheye et al. 2016a, supplement: 2 (online).
non Epimeria reoproi Lörz & Coleman, 2001: 991–1001, figs 1–5.
EtymologyThe species is dedicated to Henri Robert (Royal Belgian Institute of Natural Sciences), who collected a large part of the type material. Robertianus, -a, -um is an adjective derived from his name.
Type materialHolotype
RV Polarstern cruises:
SOUTHERN OCEAN: ♂, initially fixed in formalin, cruise PS71, ANT-XXIV/2, ANDEEP-SYSTCO, eastern Weddell Sea, given by colleagues to H. Robert on 22 Dec. 2007, presumably stn 17-10, of which
the coordinates are: 70°4.58ʹ S, 3°19.66ʹ W to 70°4.48ʹ S, 3°19.20ʹ W, 2163–2190 m, Agassiz trawl, coll. H. Robert (RBINS, INV. 132413).
Paratypes
RV Polarstern cruises:
SOUTHERN OCEAN: 1 spec., cruise PS48, ANT-XV/3, EASIZ II, stn 134, eastern Weddell Sea, 74°32.2ʹ S, 27°13.8ʹ W to 74°32.5ʹ S, 27°14.5ʹ W, 2054 – 2081 m, Agassiz trawl, 9 Feb. 1998, coll. C. De Broyer (RBINS, INV. 132991); 1 immature spec., sex undetermined, cruise PS71, ANT-XXIV/2, ANDEEP-SYSTCO, stn 17-11, eastern Weddell Sea, 70°5.13ʹ S, 3°23.50ʹ W to 70°4.66ʹ S, 3°21.37ʹ W, 1724 – 2091 m, epibenthic sledge, 22 Dec. 2007, coll. H. Robert (RBINS, INV. 132963) [extraction K44; Genbank nr, COI: KU870842, 28S: KU759618]; 2 specs, initially fixed in formalin, cruise PS71, ANT- XXIV/2, ANDEEP-SYSTCO, eastern Weddell Sea, given by colleagues to H. Robert on 22 Dec. 2007, presumably stn 17-10, of which the coordinates are: 70°4.58ʹ S, 3°19.66ʹ W to 70°4.48ʹ S, 3°19.20ʹ W, 2163 – 2190 m, Agassiz trawl, coll. H. Robert (RBINS, INV. 132413).
DescriptionROSTRUM. Long, overreaching mid of article 2 of peduncle of antenna 1, scarcely curved, sharp-tipped in lateral view.
EYE. Very large, elliptic.
PEREION–PLEOSOME TOOTH PATTERN. Pereionites 1–4 without any trace of mid-dorsal tooth and dorsolateral protrusions or teeth; pereionite 2 nearly as broad as pereionite 1; pereionite 5 with very distinct posterodorsal bump and pair of weak dorsolateral teeth; pereionite 6 with small mid-dorsal tooth (of which the anterior border is straight) and pair of weak dorsolateral teeth; pereionite 7 with low mediumsized mid-dorsal tooth (of which the anterior border is weakly curved) and pair of small dorsolateral non-carinate teeth; pleonites 1–2 with low but large and very sharp, anteriorly weakly curved mid-dorsal tooth and pair of small dorsolateral non-carinate teeth; on pleonite 1 a second pair of (much smaller) dorsolateral teeth is observed between the mid-dorsal tooth and the main pair of dorsolateral teeth; pleonite 3 with low but large acute-tipped mid-dorsal tooth bearing an inconspicuous median notch and pair of small dorsolateral non-carinate teeth (mid-dorsal teeth gradually increasing in size in a backwards direction).
COXAE 1–3. Weakly carinate and distally very sharp.
COXA 4. Not broad; anterodorsal and anteroventral border straight joined by low and blunt angular discontinuity, anterior angle not projecting forward; ventral tooth medium-sized and acute; lateral carina not sharp, without tooth or angularity, carina very distant from margin of coxa at its deepest point.
COXA 5. With long, sharp and broadly triangular, carinate, lateral tooth.
COXA 6. With mid-sized, sharp and broadly triangular, carinate, lateral tooth; posteroventral corner broadly rounded.
COXA 7. With ventral border strongly convex, with posterior border distinctly convex, their convergence forming a very rounded angular discontinuity.
EPIMERAL PLATES 1–3. Posteroventral angle: produced into a medium-sized and very sharp tooth, especially the plate 3.
UROSOME TOOTH PATTERN. Urosomite 1 with sharp tooth pointing backwards of which the anterior border is weakly convex and longer than the posterior border, and of which the posterior border is strongly curved and concave; urosomite 2 without pair of small posterior dorsolateral teeth pointing upwards.
TELSON. Cleft on 0.2; tips of lobes acute, separated by very broad V-shaped notch.
PEDUNCLE OF ANTENNA 1. Article 1 without lateral tooth, with very short medial tooth, and medium-sized ventral tooth reaching 0.4 of article 2; article 2 without lateral tooth, with very short medial tooth, and short ventral tooth reaching 0.3 of article 2; article 3 with well developed 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 slender; basis of pereiopods 5–6 narrow, with posteroproximal process rounded and very weak, not well individualized, with posterodistal tooth small but acute and obliquely directed in pereiopod 5, reduced to a squared angle in pereiopod 6; basis of pereiopod 7 broad with posterodistal tooth sharp, not followed more proximally by distinct concavity, directed obliquely.
Colour patternBody and appendages uniformly pink or pale purple, except for eyes and gnathopods, which are red (colour photograph published by Coleman 2007 and Rauschert & Arntz 2015, both as E. reoproi).
Body lengthUp to 31 mm.
DistributionEastern shelf of the Weddell Sea, 1724 – 2190 m.
RemarksRauschert & Arntz (2015) published a colour photograph of E. robertiana sp. nov. (as E. reoproi), without indicating the origin of the specimen. However, that information was given in an early draft of the book made available to the authors: ANT-XV/3, stn 134. The coordinates of that station are: 74°32.2ʹ S, 27°13.8ʹ W to 74°32.5ʹ S, 27°14.5ʹ W, 2054–2081 m. The same photograph was previously published (also as E. reoproi) by Coleman (2007) and Lörz & Coleman (2009). The inclusion of E. robertiana sp. nov. in the subgenus Drakepimeria is supported by molecular data. However, its narrow basis of pereiopod 5 and its posteriorly directed process of urosomite 1 are character states unusual for the subgenus Drakepimeria. On the other hand, these character states are frequent in non-Antarctic Epimeria species, which are predominantly deep-sea forms, just like E. robertiana sp. nov.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- RBINS
- Event date
- 2007-12-22
- Family
- Epimeriidae
- Genus
- Epimeria
- Kingdom
- Animalia
- Material sample ID
- RBINS, INV. 132413
- Order
- Amphipoda
- Phylum
- Arthropoda
- Scientific name authorship
- d'Acoz & Verheye
- Species
- robertiana
- Taxonomic status
- subgen. et sp. nov.
- Taxon rank
- species
- Type status
- holotype
- Verbatim event date
- 2007-12-22
- Taxonomic concept label
- Epimeria (Drakepimeria) robertiana d'Acoz & Verheye, 2017
References
- Coleman C. O. 2007. Synopsis of the Amphipoda of the Southern Ocean. Volume 2: Acanthonotozomellidae, Amathillopsidae, Dikwidae, Epimeriidae, Iphimediidae, Ochlesidae and Vicmusiidae. Bullelin de l'Institut Royal des Sciences Naturelles de Belgique, Biologie / Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen, Biologie 77, supplement 2: 1 - 134.
- Lorz A. - N. & Coleman O. 2009. Living gems: jewel-like creatures from the deep. Water & Atmosphere 17 (1): 16 - 17. Available from https: // www. niwa. co. nz / sites / niwa. co. nz / files / import / attachments / gems. pdf [accessed 27 Sep. 2016].
- Rauschert M. & Arntz W. E. 2015. Antarctic Macrobenthos. A Field Guide of the Invertebrates Living at the Antarctic Seafloor: Arntz & Rauschert Selbstverlag, Deichweg.
- 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
- Lorz A. - N. & Coleman O. 2001. Epimeria reoproi n. sp., a new amphipod (Epimeriidae) from the Antarctic. Crustaceana 74 (9): 991 - 1002. https: // doi. org / 10.1163 / 15685400152682728