Singhaplax rhamphe Castro 2007, n. sp.
Creators: name: Castro, Peter
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Goneplacidae
Singhaplax
Singhaplax rhamphe

description: <i>Singhaplax rhamphe</i> n. sp. (Fig. 38) TYPE MATERIAL. — KARUBAR, stn DW 29, ♂ holotype, cl 4.4 mm, cw 7.6 mm (MNHN-B 30071); ♂ paratype feminized by <i>Sacculina</i>, cl 4.0 mm, cw 6.7 mm; ♂ paratype, cl 2.3 mm, cw 4.2 mm (MNHN-B 30072). TYPE LOCALITY. — Indonesia, Kai Islands, 05°36'S, 132°56'E, 181- 184 m. MATERIAL EXAMINED. — <b>Indonesia.</b> Kai Is, KARUBAR, stn DW 29, 05°36'S, 132°56'E, 181-184 m, 26.X.1991, ♂ holotype, cl 4.4 mm, cw 7.6 mm (MNHN-B 30071); 1 ♂ paratype feminized by <i>Sacculina</i>, cl 4.0 mm, cw 6.7 mm, 1 ♂ paratype, cl 2.3 mm, cw 4.2 mm (MNHN-B 30072). ETYMOLOGY. — From <i>rhamphe</i>, Greek for "curved knife", noun in apposition, in reference to the curved G1 characteristic of the species. DISTRIBUTION. — Known only from Indonesia (Kai Is). Depth: 181- 184 m. DESCRIPTION Carapace (Fig. 38A) transversely rectangular, much wider than long (1.7 as wide as long in holotype). Carapace convex, without clear indication of regions. Front slightly convex, almost straight. Slight notch between front, inner edge of supraorbital border. Supraorbital borders broad, conspicuously sinuous, smooth, with long simple setae. Suborbital borders conspicuously sinuous, with short, acute granules; conspicuous, triangular inner tooth. Long, slender, acute tooth on outer orbital angle; tooth medially placed on carapace. Lateral borders beyond outer orbital teeth slightly convex, no anterolateral teeth. Subhepatic, pterygostomial regions, with low, round tubercles. Eye peduncles (Fig. 38A) long (0.9 front width), cornea elongated, spherical distal margin, not reniform. Chelipeds (P1) slightly unequal (female unknown); fingers slender, dactylus curved, slightly shorter than propodus, with blunt teeth; no dark colour on fingers; inner (ventral) margin of propodus smooth. Broad tooth on inner (ventral), proximal margin of carpus; outer (dorsal) margin of merus with low tubercles, long simple setae. Ambulatory legs (P2-P5) long, slender, unarmed, varying number of long simple setae; dactyli long, slender, each with 2 carinae along each side; length of P5 merus 0.8 cl. Male abdomen wide (see abdomen of <i>S. platypoda</i> n. sp., Fig. 36A), with 6 freely-movable somites plus telson; telson slightly wider than long. Somite 3 covers most of space between P5 coxae; somite 2 only slightly narrower than somite 3, leaving relatively small portion of thoracic sternite 8 visible. G1 (Fig. 38B) long, slightly wider basal part, curved distal part with small denticles along outer margin; slightly pointed, grooved tip. G2 (Fig. 38C) slender, long, nearly equal or slightly longer than G1, curved flagellum about as long as proximal part (peduncle), tip with terminal spinule. Female unknown. REMARKS <i>Singhaplax rhamphe</i> n. sp. was collected from the same station in the Kai Is, Indonesia as <i>S. dichotoma</i> n. sp. Four other species of <i>Singhaplax</i> were also collected from different stations but in a similar habitat from the same region. All four are morphologically close species that appear to be sympatric (see Remarks for <i>S. orientalis</i> above). The new species is distinguished from the other described species of <i>Singhaplax</i> by its characteristic G1, which has a curved distal part with small denticles along the outer margin and a grooved tip (Fig. 38B). The tip of the G2 has a terminal spinule (Fig. 38C).
description: Published as part of <i>Castro, Peter, 2007, A reappraisal of the family Goneplacidae MacLeay, 1838 (Crustacea, Decapoda, Brachyura) and revision of the subfamily Goneplacinae, with the description of 10 new genera and 18 new species, pp. 609-774 in Zoosystema 29 (4)</i> on pages 718-720, DOI: 10.5281/zenodo.4525564