Identity of the freshwater crab Indochinamon beieri (Pretzmann, 1966), with the description of a new genus and four new species from northeastern India (Decapoda, Brachyura, Potamidae) Author Pati, Sameer K. Zoological Survey of India, Western Regional Centre, Akurdi, Pune 411 044 (India) sameer_pati@yahoo.co.in Author Mitra, Santanu Zoological Survey of India, Crustacea Section, Fire Proof Spirit Building, 27 Jawaharlal Nehru Road, Kolkata 700 016 (India) Author Ng, Peter K. L. Lee Kong Chian Natural History Museum, National University of Singapore, 2 Conservatory Drive, Singapore 117377 (Republic of Singapore) text Zoosystema 2024 2024-09-24 46 23 589 615 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2024v46a23.pdf journal article 303655 10.5252/zoosystema2024v46a23 a09a56e8-aea6-4574-b583-ca084c7e3223 1638-9387 13837101 9195A8AB-6FA8-4828-B8D1-DDEC94E99A6D Capitamon meitei n. sp. ( Figs 12 ; 13 ; 14 ) urn:lsid:zoobank.org:act: 109C2D01-A922-4EE1-ABCE-710D7E91F2F2 TYPE MATERIAL . — Holotype . India • ♂ (51.7 × 38.8 mm ); Manipur state : Thoubal district : Yairipok ; 24°39’53”N , 94°3’50”E ; alt. 784 m ; 24.XI.2018 ; Thangpurba Devi leg.; ZSI-WRC C.2405 . Paratypes . India • ♂ (39.9 × 30.4 mm ), ♀ (36.0 × 27.4 mm ); Manipur state : Kangpokpi district : Leimakhong ; 24°56’31”N , 93°50’27”E ; alt. 884 m ; 27.V.2019 ; Thangpurba Devi leg.; ZSI-WRC C.2406. FIG . 11. — Capitamon manipurense ( Alcock, 1909 ) n. comb. , lectotype ♂ (39.9 × 30.0 mm) (ZSIK C.6923/3): A , left G1 ultimate article (dorsal view); B , left G2; C , left G1 ultimate article (ventral view); D , left G1 (dorsal view); E , left G1 (ventral view). Scale bar: A, C, 0.5 mm; B, D, E, 1 mm. DIAGNOSIS . — Carapace ovate, broader than long ( CW /CL = 1.3- 1.4), 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 continuous, reaching to level of postorbital cristae; epistome posterior margin with well-developed, triangular median tooth, outer parts sloping downwards laterally ( Fig. 12A, B ). Third maxilliped exopod with short flagellum, shorter than width of merus ( Fig. 13B ). Chelipeds rugose, unequal in adult males, inner distal tooth on carpus relatively broad ( Figs 12A, C ; 13C ). Male s3/s4 indiscernible ( Figs 12C ; 13D ). Male pleonal somite 6 relatively broader (proximal width c . 2.1-2.2 × medial length), equal in length to pleonal somite 5, with convex lateral margins ( Figs 12C ; 13E ). Male telson relatively broader (proximal width c. 1.3-1.4 × medial length), with gently to strongly concave lateral margins ( Figs 12C ; 13E ). G1 ultimate article relatively less strongly bent at angle of about 75° from longitudinal axis, with sinuous outer margin, dorsal flap relatively high, narrowly triangular ( Figs 13F ; 14A , C-E). G2 c. 1.2 × length of G1; ultimate article long, c. 0.5 × length of penultimate article ( Figs 13G ; 14B, D ). Vulvae laterally completely covered by protruding sternal cover, invisible in ventral view ( Fig. 13I ). ETYMOLOGY . — The species name, meitei , means Manipuri, the people/language of Manipur . The name is used as a Latin noun in apposition. GEOGRAPHICAL DISTRIBUTION . — Capitamon meitei n. gen., n. sp. is known only from Manipur state of northeastern India ( Fig. 1 ). REMARKS Among the nominal species of the genus, C. meitei n. gen., n. sp. most resembles C. mizoramense n. gen., n. sp. mainly by the G1 ultimate article, which has a sinuous outer margin, and the relatively high and narrowly triangular dorsal flap ( Figs 13F ; 14A , C-E; 16F; 17A, C-E). Capitamon meitei n. gen., n. sp. is nevertheless differentiated from C. mizoramense n. gen., n. sp. by the relatively less strongly bent G1 ultimate article, which is bent at an angle of about 75° from longitudinal axis of the G1 ( Figs 13F ; 14D, E ) (vs G1 ultimate article more strongly bent at an angle of about 110° from longitudinal axis of the G1; Figs 16F ; 17D, E ). In addition, the vulvae are completely covered laterally by the protruding sternal cover and invisible in the ventral view in C. meitei n. gen., n. sp. ( Fig. 13I ), whereas the vulvae are partially covered laterally by the protruding sternal cover and visible in the ventral view in C. mizoramense n. gen., n. sp. ( Fig. 16I ).