A new species of freshwater crab of the genus Himalayapotamon Pretzmann, 1966 (Decapoda, Brachyura: Potamidae: Potaminae) from Uttarakhand, northern India Author Pati, S. K. Author Singh, S. text Zootaxa 2017 4237 1 191 200 journal article 36434 10.11646/zootaxa.4237.1.11 36ab8d3a-955c-42a6-8fe3-a49f146c854c 1175-5326 322771 3B99DC75-4231-478C-9831-D03E7B0BAE93 Key to the species of Himalayapotamon 1. Sixth male abdominal somite short, median length nearly two-fifth greatest width ( Fig. 5C )..........................2 - Sixth male abdominal somite long, median length nearly half greatest width ( Figs. 2 C, 5D)......................... 3 2. G1 terminal joint conical, with tip slightly curved outwards ( Fig. 5 E)............................................................................................. H. bifarium ( Alcock, 1909 ) [ INDIA ( Sikkim )? or MYANMAR ?] - G1 terminal joint S-shaped ( Fig. 5 F)............... H. monticola ( Alcock, 1910 ) [ INDIA ( Meghalaya and West Bengal )] 3. Male telson with acute apex (see Pretzmann 1966 : pl. 3, fig. 11)..................................................................................................... H. kasaulis ( Pretzmann, 1966 ) [ INDIA ( Himachal Pradesh )] - Male telson with rounded apex ( Figs. 2 C, 5D)............................................................. 4 4. Epigastric and postorbital cristae separated by indistinct groove ( Fig. 5B )............................................................................................... H. ambivium ( Alcock, 1909 ) [ INDIA ( Himachal Pradesh )] - Epigastric and postorbital cristae separated by distinct groove ( Fig. 2 A)......................................... 5 5. G1 terminal joint sinuous (see Brandis 2001 : fig. 3c).................................................................... H. atkinsonianum (Wood-Mason, 1871) [ BHUTAN , INDIA ( Meghalaya, Sikkim and West Bengal ) and NEPAL ] - G1 terminal joint conical, with almost straight margins ( Fig. 3 A)............................................... 6 6. G1 terminal joint slender (see Brandis 2001 : fig. 4c)......................................................... 7 - G1 terminal joint stout ( Fig. 3 A)......................................................................... 9 7. G1 terminal joint blunt towards tip (see Brandis 2001 : fig. 4c).................................................... H. emphyseteum ( Alcock, 1909 ) [ INDIA ( Himachal Pradesh, Jammu and Kashmir and Uttarakhand ), NEPAL and PAKISTAN ] - G1 terminal joint distinctly narrowing towards tip (see Bott 1970 : pl. 38, fig. 19).................................. 8 8. G1 terminal joint short, ca. 0.3 times length of subterminal joint (see Bott 1970 : pl. 38, fig. 19)............................................. H. koolooense ( Rathbun, 1904 ) [ AFGHANISTAN , INDIA ( Himachal Pradesh, Meghalaya, Sikkim, Uttar Pradesh, Uttarakhand and West Bengal ) and NEPAL ] - G1 terminal joint long, ca. 0.4 times length of subterminal joint (see Brandis & Sharma 2005 : fig. 5C).............................................................................. H. sunkoshiense Brandis & Sharma, 2005 [ NEPAL ] 9. G1 terminal joint suddenly tapers distally (see Bouvier 1918 : fig. 10I ).................................................................................................. H. babaulti ( Bouvier, 1918 ) [ INDIA ( Himachal Pradesh )] - G1 terminal joint gradually tapers distally ( Fig. 3 B).........................................................10 10. Postorbital cristae almost straight (see Pretzmann 1963 : pl. 1, fig. 1); male telson with straight lateral margins (see Pretzmann 1963 : pl. 1, fig. 4); G1 terminal joint long, ca. 0.3 times combined length of subterminal joint and flexible zone (see Pretzmann 1963 : pl. 3, fig. 11)........................................ H. marinellii ( Pretzmann, 1963 ) [ INDIA ( West Bengal )] - Postorbital cristae distinctly curved ( Fig. 2 A); male telson with concave lateral margins ( Fig. 2 C); G1 terminal joint short, ca. 0.2 times combined length of subterminal joint and flexible zone ( Fig. 3 A).... H. garhwalense n. sp. [ INDIA ( Uttarakhand )]