Gordonopsis phorcys Ng &amp; Forges 2020, new species
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 phorcys

description: <i>Gordonopsis phorcys</i>, new species (Figs. 21–23) <b>Material examined.</b> Holotype: female (10.9 × 16.8 mm) (MNHN-IU-2008-12211 = MNHN B30261), station CP2197, southwest of Santa Isabel, 8°24.4′N, 159°22.5′E, Solomon Islands, 897–1,057 m, coll. Expedition SALOMON 2, N.O. Alis, November 2004. <b>Diagnosis.</b> Female: carapace longitudinally ovate, width to length ratio 0.65, distinctly wider posteriorly than anteriorly; dorsal carapace surface with well-defined regions, separated by broad, deep grooves; lateral margin gently convex; dorsal parts with scattered soft setae that do not obscure surface; lateral parts with setae that do not obscure surface (Figs. 21 A–C, 22A, B). Rostrum long, sharp, with 2 long, obliquely directed pseudorostral spines, just shorter than rostrum (Fig. 21B). Supraorbital margin relatively narrow, C-shaped; pseudorostral spines directed obliquely laterally at angle of about 45° (Fig. 21B). Eyes with short ocular peduncle, cornea prominent; no discernible orbit (Fig. 21B). Hepatic region gently inflated, with short obliquely directed spine (Fig. 21B). Gastric region without spines (Fig. 21B). Gastric groove well marked, with distinct ovate gastric fossae just above (Fig. 21B). Cardiac region swollen; branchial region inflated, with distinct branchio-cardiac grooves (Fig. 21B). Latero-posterior tubercle on carapace low, just discernible as granule (Fig. 21B). Base of antenna with distinct spine (Fig. 22D). Antennal flagellum short, second and third articles thick, setose. Epistome triangular (Fig. 22D). Third maxilliped pediform, merus elongate with angular external angle (Fig. 22C). Chelipeds long; fingers long, greater than half length of palm; surface gently rugose with scattered small granules; carpus longitudinally ovate, outer margin with 1 or 2 long spines and sometimes a third spinule, distal edge with 1 long spine, inner margin with 1 long spine, sometimes with 1 more spinule, dorsal surface with longitudinal row of 3 short spines; merus triangular in cross-section, relatively long, curved, dorsal margin with 8 spines and distal 2 spines bracketing chela, outer ventral margin with 7 or 8 spines, inner ventral margin with 5 or 6 spinules (Fig. 22 E–H). Ambulatory legs very long; basisischium with 4 distinct curved spines on each margin, that on P4 sometimes with additional ventral spine; P2 merus with 4 spines on dorsal margin (excluding 1 distal spine), ventral margin with 1 or 2 spinules or sharp granules; P3 merus with 3 spines on dorsal margin (excluding 1 distal spine), ventral margin with 1 spinule; P4 merus with 2 spines on dorsal margin (excluding 1 distal spine), ventral margin unarmed, outer surface with 1 strong proximal spine (Figs. 21A, 23 C–E). 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 8 spines, that of dactylus with 8 spines (Fig. 23A, F, G). Outer margin of P2 coxa with l short, stout spine on distal edge; outer margin of P3 coxa with 1 or 2 strong curved spines on each edge, outer margin of P4 coxa with 2 strong curved spines on each edge (Figs. 22I, J, 23B, H). Proximal part of telson subtruncate, with distal half triangular (Fig. 23B). <b>Colour.</b> Not known. <b>Etymology.</b> The species is named after Phorcys, a primordial Greek sea god, son of Gaia, brother and husband of Ceto. The name is used as a noun. <b>Remarks.</b> See general discussion for comparisons with congeners.
description: Published as part of <i>Ng, Peter K. L. &amp; Forges, Bertrand Richer de, 2020, A revision of the deep-sea porter crabs of the genus Gordonopsis Guinot &amp; Richer de Forges, 1995 (Crustacea, Decapoda, Brachyura, Homolidae), with descriptions of five new species, pp. 267-307 in Raffles Bulletin of Zoology 68</i> on page 292, DOI: 10.26107/RBZ-2020-0023, http://zenodo.org/record/4576743