Parapleisticantha Yokoya, 1933, a valid genus of deep-sea inachid spider crab from Japan and the Philippines (Crustacea: Decapoda: Brachyura: Majoidea), with the description of a new species Author Forges, Bertrand Richer De Author Ng, Peter K. L. Author Ahyong, Shane T. text Zootaxa 2013 3635 1 15 26 journal article 10.11646/zootaxa.3635.1.2 49b09288-829c-4211-ad42-c58847dccb4d 1175-5326 283510 D35BD9A0-5251-4517-8C94-CB3BC7FB3C23 Parapleisticantha japonica Yokoya, 1933 ( Figs. 1–3 , 6A–E ) Parapleisticantha japonica Yokoya, 1933: 140 , text-fig. 50.—Ng & Richer de Forges 2012: 65. Pleistacantha ( Parapleisticantha ) japonica .—Sakai 1938: 238; 1940: 55. Pleistacantha japonica . —Takeda & Miyake 1969: 494, pl. 18, fig. A, text-figs 9c, d.—Sakai, 1976: 174; 1986: 2, 3, text figure 1.—Ahyong et al . 2005: 1–8. Not Pleistacantha japonica .— Guinot & Richer de Forges 1982: 112, fig. 7A, pl. III, 4, 4a. Material examined. Japan , southeast of Goto Is., station 431, 152 m , coll. R/V Soyo-Maru , 16 July 1929 (KMNH): lectotype male (22.4 × 16.8 mm ), 1 paralectotype ovigerous female (16.6 × 13.1 mm ). Comparative material . Pleistacantha sanctijohannis : Philippines , Balicasag Is., 200–300 m , tangle nets, coll. P.K.L. Ng, June 2002 (ZRC 2002.0669): 3 males (16.6 × 13.1 mm , 17.9 × 15.2 mm , 13.6 × 9.7 mm ), 2 ovigerous females (19.9 × 16.1 mm , 18.4 × 15.4 mm ).— Pleistacantha cervicornis : Philippines , station CP 2380, 8°41.3’N , 123°17.8’E , 163–271 m , coll. PANGLAO 2005, 28 May 2005 (ZRC): 1 male (21.3 × 15.8 mm ), 8 ovigerous females (20.4 × 15.6 mm , 18.9 × 14.4 mm , 15.2 × 11.3 mm , 16.6 × 12.5 mm , 17.9 × 12.9 mm , 16.8 × 13.3 mm , 15.6 × 11.7 mm , 15.9 × 12.1 mm ); Vanuatu , station AT 27, 15°22.4’S , 167°15.4’E , 339–345 m , coll. SANTO 2006, 23 September 2006 (ZRC): 1 ovigerous female (17.5 × 13.9 mm ); Vanuatu , station AT 28, 15°23.6’S , 167°16.1’E , 342–350 m , 23 September 2006 : 1 male (11.6 × 7.9 mm ), 1 ovigerous female (14.9 × 11.2 mm ).— Pleistacantha oryx : Philippines , station CP 2716, 14°31’N , 121°60.8’E , 311–361 m , coll. AURORA 2007, 29 May 2007 (ZRC): 1 male (25.7 × 18.8 mm , photographed).— Philippines , Balicasag Is., from fishermen by tangle nets, coll. P.K.L. Ng, 2 March 2004 (ZRC): 1 ovigerous female (27.0 × 23.6 mm ).— Japan , Sagami Sea, Okinose, 540 m , Mortensen Expedition, 28 June 1942 (AM P34571): 2 males (26.1 × 18.2 mm , 27.0 × 19.4 mm ), 2 ovigerous females (22.1 × 16.5 mm , 25.3 × 19.0 mm). Description. Small-sized species (ovigerous female less than 17 mm long); carapace regularly covered with short spiniform granules, spinules; larger spines arranged as follows: 5 on gastric area, 2 on cardiac area, 2 on branchial area; branchial regions gently convex ( Figs. 1 A, B, 2A, 3A, B). Rostrum horns diverging, forming Vshape ( Figs. 1 , 2 A, 3); each horn relatively short, with 2 lateral accessory spines (1 proximal, 1 shorter near midlength); ventral face of horns with 2 strong spines; distal border of antennular fossa with distal spine pointing outward; 2 sharp postocular; subhepatic tooth comparatively long ( Figs. 1 C, 2A). Eyes with short peduncle, small rounded cornea ( Figs. 1 , 2 A, 3). Supraorbital eave large, border with 3 or 4 teeth; supraocular spine short; intercalated spine small, infraocular spine longest ( Figs. 1 , 2 A, D, 3). Hepatic region with several spines, longest pointing outwards ( Figs. 1 , 2 A, D, 3). Interantennular spine (true rostrum) bifid ( Fig. 2 A). Basal antennal article long with 6 long spines arranged on border of article, 3 internal, 3 external ( Figs. 1 C, 2A, D). Third maxilliped pediform: ischium with 2 longitudinal rows of sharp granules on outer surface, lateral row with 5 granules, mesial row with 3 granules; merus subtriangular, longer than broad, with 2 sharp granules on outer surface ( Fig. 2 C). Male chelipeds with strong chelae, inflated palm; dactylus with 2 large teeth on inner border; cross-section of merus trigonal, each angle with a row of sharp spines; propodal margin below articulation of dactylus and pollex with distinct subtruncate granulated process; cutting edge of propodal finger with distinct, evenly sized teeth ( Figs. 1 A, 2E). Ambulatory legs long; P2 longest, merus shorter than carapace length (0.91 cl in lectotype ); P5 merus 0.62 cl (male lectotype ), 0.48 cl ( paralectotype female); merus with subdistal dorsal spine; dorsal and ventral margins lined with sharp spinules ( Figs. 1 A, 3A). Abdomen of both sexes with 6 free somites and telson; distal margin of somite 6 deeply concave ( Fig. 2 B). G1 stout, straight along basal two-thirds, distal part sharply bent outwards, forming 90° angle, lined with setae on straight part, distal part without subdistal process ( Fig. 6A–C ); G2 about half as long as G1, tip spatuliform ( Fig. 6E ). Ovigerous female smaller than males with chelipeds not inflated ( Fig. 3 A), body relatively more setose than males ( Fig. 3 ); abdomen dome-shaped, covering entire thoracic sternum ( Fig. 3 C). FIGURE 1 . Parapleisticantha japonica Yokoya, 1933 . Lectotype male (22.4 × 16.8 mm) (KMNH), Goto Is., Japan. A, habitus; B, dorsal view of carapace; C, ventral view of cephalothorax showing epistome, antennules and antennae. FIGURE 2 . Parapleisticantha japonica Yokoya, 1933 . Lectotype male 22.4 × 16.8 mm (KMNH), Goto Is., Japan. A, frontal view showing rostrum and eyes; B, ventral view showing anterior thoracic sternum and abdomen; C, left third maxilliped; D, lateral view of carapace; E, outer view of left chela. FIGURE 3 . Parapleisticantha japonica Yokoya, 1933 . Paralectotype ovigerous female (16.6 x 13.1 mm) (KMNH), Goto Is., Japan. A, habitus; B, dorsal view of carapace; C, ventral view showing anterior thoracic sternum and abdomen. Remarks. The two specimens used in the diagnosis are syntypes as Yokoya did not select a holotype . The male specimen is here designated the lectotype , the female as paralectoype. Parapleisticantha japonica is presently known only from Japan . The small female attributed to P. japonica from New Caledonia (MNHN B7275, 16.5 × 10.0 mm; Guinot & Richer de Forges 1982) has been re-examined and represents a species of Pleistacantha currently under study.