Gordonopsis robusta Ng, Padate & Saravanane 2019
Creators: name: Ng, Peter K. L.
name: Forges, Bertrand Richer de
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Homolidae
Gordonopsis
Gordonopsis robusta

description: Gordonopsis robusta Ng, Padate & Saravanane, 2019   
(Figs. 12, 13)  
 Gordonopsis robusta Ng, Padate & Saravanane, 2019: 511, figs. 1–4.   
 Material examined. Holotype: male (33.5 × 44.9 mm) (CMLRE IO/SS/BRC/00082), Andaman Sea, FORVSS station 36708, 13.27°N, 93.26°E, 635 m, HSDT (CV), coll. S. S. Cubelio, 26 November 2017. Paratype: 1 young female (15.6 × 20.8 mm) (CMLRE IO/SS/BRC/00083), same data as holotype.   
 Diagnosis. Male: 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 dense soft setae partially obscuring surface; lateral parts densely setose, completely obscuring surface (Figs. 12 A–D, 13A, B). Rostrum relatively long, sharp, with 2 relatively long, obliquely directed pseudorostral spines, just shorter than rostrum (Fig. 12C). Supraorbital margin relatively narrow, C-shaped; pseudorostral spines directed obliquely laterally at angle of about 45° (Fig. 12C). Supraorbital margin relatively narrow, C-shaped; pseudorostral spines directed obliquely laterally at angle of about 45° (Fig. 12C). Eyes with short ocular peduncle, cornea prominent; no discernible orbit (Fig. 12C). Hepatic region gently inflated, with short obliquely directed spine (Fig. 12C). Gastric region without spines (Fig. 12C). Gastric groove well marked, with distinct ovate gastric fossae just above (Fig. 12C). Cardiac region swollen; branchial region inflated, with distinct branchio-cardiac grooves (Fig. 12C). Latero-posterior tubercle strong, sharp (Fig. 12C). Base of antenna with short spine. Antennal flagellum short, second and third articles thick, setose. Epistome triangular. Third maxilliped pediform, merus elongate with dentiform external angle (Fig. 13C). Chelipeds long; fingers short, less than half length of palm; surface gently rugose with 4 or 5 longitudinal rows of small granules, margins with sharp granules and short spines; carpus longitudinally ovate, outer margin with 8–10 short spines, distal edge with short spine, inner margin with 5 or 6 spines, dorsal surface with ridge lined with 3–5 short sharp tubercles or granules; merus triangular in cross-section, relatively long, curved, dorsal margin with 5 short spines and distal 2 spines bracketing chela, outer ventral margin with 16–18 spines and spinules, inner ventral margin with 6–8 spines or spinules (Figs. 12A, E, 13F). Ambulatory legs relatively long; basis-ischium with small granules, not spines; P2 merus with 6 spines or sharp tubercles on dorsal margin (excluding 1 distal spine), ventral margin with 3–5 spinules or tubercles; P3 merus with 5 spines on dorsal margin (excluding 1 distal spine), ventral margin with 1 or 2 sharp tubercles; P4 merus not known (Figs. 12A, B, 13G, H). P5 merus slender, unarmed on all margins, just reaching gastric groove when folded anteriorly; carpus long, propodus short, enlarged, forming prominent pseudochela with stout, gently curved dactylus; occlusal margin of fixed finger with 8 spines, that of dactylus with 8 spines (Figs. 12D, 13I, J). Outer margins of P2–P4 coxae smooth, unarmed (Fig. 13D, E). Telson triangular, with gently convex lateral margins and sharp tip (Fig. 13D, E). G1 short, stout, distal part gently upcurved, tip concave (Fig. 13K). G2 stout, tubular, length subequal to G1, distal portion cup-shaped (Fig. 13L). Female: non-sexual characters similar to male except cheliped merus with 6 spines on upper margin, 8 short spines and tubercles on outer ventral margin, 5 or 6 sharp tubercles on inner ventral margin; P2 merus with 5 spines on dorsal margin, ventral margin with 1 sharp tubercle; P3 merus with 5 spines on dorsal margin, ventral margin with 1 sharp tubercle; P4 with 3 spines on dorsal margin, ventral margin unarmed; telson broadly triangular with convex lateral margins.   
 Colour. Not known.   
 Remarks. See general discussion for comparisons with congeners.
description: Published as part of 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, pp. 267-307 in Raffles Bulletin of Zoology 68 on pages 278-284, DOI: 10.26107/RBZ-2020-0023, http://zenodo.org/record/4576743