Gordonopsis velutina, Ng & Forges, 2020

Ng, Peter K. L. & Forges, Bertrand Richer de, 2020, A revision of the deep-sea porter crabs of the genus Gordonopsis Guinot & Richer de Forges, 1995 (Crustacea, Decapoda, Brachyura, Homolidae), with descriptions of five new species, Raffles Bulletin of Zoology 68, pp. 267-307 : 299

publication ID

https://doi.org/ 10.26107/RBZ-2020-0023

publication LSID

lsid:zoobank.org:pub:057B08EE-1006-43E8-AE20-0AF8F224BA2D

DOI

https://doi.org/10.5281/zenodo.4576672

persistent identifier

https://treatment.plazi.org/id/7FF8DE85-B247-41D4-97E0-D2DFDCC2675D

taxon LSID

lsid:zoobank.org:act:7FF8DE85-B247-41D4-97E0-D2DFDCC2675D

treatment provided by

Carolina

scientific name

Gordonopsis velutina
status

sp. nov.

Gordonopsis velutina View in CoL , new species

( Figs. 27–29 View Fig View Fig View Fig )

Material examined. Holotype: female (20.8 × 27.8 mm) (MNHN-IU-2013-2269), station CP4249, southeast of Sherburne reefs, southeast Admiralty Islands, Bismark Sea, 3°31′S, 148°05′E, 598–650 m, coll. Expedition MADEEP, N.O. Alis, 23 April 2014. GoogleMaps

Diagnosis. Female: carapace longitudinally ovate, width to length ratio 0.75, distinctly wider posteriorly than anteriorly; dorsal carapace surface with well-defined regions, separated by broad, deep grooves; lateral margin distinctly convex; dorsal parts with numerous soft and stiff setae that almost completely obscure surface; lateral parts with denser setae that obscure surface, relatively denser on hepatic, pterygostomial and suborbital regions ( Figs. 27 View Fig A–C, 28A, B, 30C). Rostrum relatively long, sharp, with 2 long, obliquely directed pseudorostral spines, just shorter than rostrum ( Fig. 27B View Fig ). Supraorbital margin relatively narrow, C-shaped; pseudorostral spines directed obliquely laterally at angle of about 45° ( Fig. 27B View Fig ). Eyes with short ocular peduncle, cornea prominent; no discernible orbit ( Fig. 27B View Fig ). Hepatic region gently inflated, with short obliquely directed spine ( Fig. 27B View Fig ). Gastric region without spines ( Fig. 27B View Fig ). Gastric groove well marked, with distinct ovate gastric fossae just above ( Fig. 27B View Fig ). Cardiac region swollen; branchial region inflated, with distinct branchio-cardiac grooves ( Fig. 27B View Fig ). Latero-posterior tubercle on carapace barely visible only as slight swelling ( Fig. 27B View Fig ). Base of antenna with distinct spine ( Fig. 28D View Fig ). Antennal flagellum short, second and third articles thick, setose. Epistome triangular ( Fig. 28D View Fig ). Third maxilliped pediform, merus elongate with slightly rounded external angle ( Fig. 28C View Fig ). Chelipeds long; fingers long, slightly greater than half length of palm; surface gently rugose with scattered small granules; carpus longitudinally ovate, outer, distal and inner margins with 1 long spine each, dorsal surface with low ridge, unarmed; merus triangular in cross-section, relatively long, curved, dorsal margin with 6 or 7 spines and 1 distal spine adjacent to chela, outer ventral margin with 6 or 7 spines, inner ventral margin with 5 or 6 spinules ( Figs. 27A View Fig , 28 View Fig E–H). Ambulatory legs long; basisischium with small granules, not spines; P2 merus with 3 spines on dorsal margin (excluding 1 distal spine), ventral margin unarmed; P3 merus with 2 or 4 spinules on dorsal and subdorsal margins (excluding 1 distal spine), ventral margin unarmed; P4 merus with 0 or 4 spinules on dorsal and subdorsal margins (excluding 1 distal spine), ventral margin unarmed, outer surface with 1 distinct granule ( Figs. 27A View Fig , 29A View Fig , F–H). P5 merus slender, unarmed on all margins, reaching beyond gastric groove when folded anteriorly; carpus long, propodus short, enlarged, forming prominent pseudochela with stout, gently curved dactylus; occlusal margin of fixed finger with 7 spines, that of dactylus with 7 spines ( Fig. 29A, I, J View Fig ). Outer margins of P2–P4 coxae smooth, unarmed ( Fig. 29 View Fig C–E). Proximal part of telson subcircular with strongly convex lateral margins, distal part triangular ( Fig. 29B View Fig ).

Colour. The carapace and appendages are dirty white, with the setae yellowish-brown ( Fig. 30C View Fig ).

Etymology. The name is derived from the Latin word for velvety, alluding to the dense setae all over the body of the species.

Remarks. See general discussion for comparisons with congeners.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Homolidae

Genus

Gordonopsis

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