Capitamon manipurense (Alcock, 1909) n. comb.

(Fig. 11)

Potamon (Potamon) andersonianum var. manipurense Alcock, 1909: 244; 1910: 35, pl. 14 fig. 68.

Potamon andersonianum – Bott 1970: 142 (in part) [not Telphusa andersoniana Wood-Mason, 1871].

Potamiscus andersonianus – Brandis 2000: 68 (in part) [not Telphusa andersoniana Wood-Mason, 1871].

Indochinamon manipurense – Yeo & Ng 2007: 283 (list). — Ng et al. 2008: 163 (list). — Ng & Win Mar 2018: 49 (list). — Pati et al. 2020: 706.

TYPE MATERIAL. — Lectotype. India • ♂ (39.9 × 30.0 mm); Manipur state: Manipur Hills; [c. 24°50’41”N, 93°54’14”E]; [c. alt. 986 m]; no date; H. H. Godwin-Austen leg.; ZSIK C.6923/3.

Paralectotype. India • ♀ (40.1 × 30.4 mm); same data as for lectotype; ZSIK C.6923/3 .

DIAGNOSIS. — Carapace ovate, broader than long (CW/CL = 1.3), relatively low (CH /CW = 0.4); epigastric cristae well-developed, rugose; postorbital cristae well-developed, relatively sharp, oblique in dorsal view; external orbital angle triangular, with short outer margin, c. 2 × inner margin; epibranchial tooth low, blunt, positioned above level of postorbital cristae; cervical grooves discontinuous, not reaching to level of postorbital cristae; epistome posterior margin with well-developed, triangular median tooth, outer parts sloping downwards laterally (see Pati et al. 2020: figs 1a; 2a, b). Third maxilliped exopod with short flagellum, shorter than width of merus (see Pati et al. 2020: fig. 2c). Chelipeds rugose, unequal, inner distal tooth on carpus relatively broad (see Pati et al. 2020: fig. 1a). Male s3/s4 indiscernible except for two short lateral clefts (see Pati et al. 2020: figs 1b; 2e). Male pleonal somite 6 relatively broader (proximal width c. 2.0 × medial length), longer than pleonal somite 5, with almost straight lateral margins (see Pati et al. 2020: figs 1b; 2d). Male telson relatively narrower (proximal width c. 1.2 × medial length), with strongly concave lateral margins (see Pati et al. 2020: figs 1b; 2d). G1 ultimate article relatively less strongly bent at angle of about 60° from longitudinal axis, with straight outer margin, dorsal flap relatively low, broadly triangular (Fig. 11A, C-E; see Pati et al. 2020: figs 4a-d; 5a-c). G2 c. 1.3 × length of G1; ultimate article long, c. 0.5 × length of penultimate article (Fig. 11B, D; see Pati et al. 2020: figs 4a, e; 5a, d). Vulvae laterally partially covered by protruding sternal cover, visible in ventral view (see Pati et al. 2020: fig. 3c).

GEOGRAPHICAL DISTRIBUTION. — Capitamon manipurense n. comb. is known only from Manipur state of northeastern India (see Pati et al. 2020) (Fig. 1).

REMARKS

Capitamon manipurense n. comb. can easily be distinguished from the nominal species of the genus by the relatively narrower male telson, proximal width c. 1.2 times the medial length (see Pati et al. 2020: figs 1b; 2d) (vs male telson relatively broader, proximal width c. 1.3-1.4 times the medial length; Figs 5C; 6E; 8B; 9D; 12C; 13E; 15C; 16E) and the relatively less strongly bent G1 ultimate article, which is bent at an angle of about 60° from longitudinal axis of the G1 (Fig. 11D, E; see Pati et al. 2020: figs 4a, d; 5a, c) (vs G1 ultimate article relatively more strongly bent at an angle of about 75-110° from longitudinal axis of the G1; Figs 6F; 7D, E; 8C; 10A; 11D, E; 13F; 14D, E; 16F; 17D, E). Otherwise, C. manipurense n. comb. is most similar to C. capitatum n. gen., n. sp. and C. clarki n. gen., n. sp. as their G1 ultimate article has the relatively low and broadly triangular dorsal flap (Figs 6F; 7A, C-E; 8C; 10A, B, D; 11A, C-E; see Pati et al. 2020: figs 4a-d; 5a-c).