Abstract
Two new species of freshwater crabs of the potamid genus Potamiscus Alcock, 1909 are described from Nagaland State of northeastern India. Potamiscus chizami sp. nov. and Potamiscus mima sp. nov. most resemble two Indian congeners [Potamiscus palelensis Mitra and Waikhom, 2019 and Potamiscus tumidulus (Alcock, 1909)] and a species from Myanmar (Potamiscus whitteni Ng, Hla Htoo and Win Mar, 2020) due to the similar terminal segment of the male first gonopod. Both new species can be distinguished from Po. palelensis by their stouter ambulatory legs, from Po. tumidulus by their more-slender male first gonopod, and from Po. whitteni by their strongly concave lateral margins of the male telson and the straight tip of the male first gonopod. Characters of the carapace, male pleon, male gonopods, and female vulvae are employed to differentiate Po. chizami sp. nov. from Po. mima sp. nov.
Highlights
The freshwater crab genus, Potamiscus Alcock, 1909, of the family Potamidae Ortmann, 1896, is so far known by 18 species from China (Guangxi, Yunnan, and Tibet), Myanmar, and northeastern India
Molecular studies on some of the species have already challenged the monophyly of Potamiscus
The material examined is deposited in the Zoological Survey of India, Western Regional Centre, Pune, India (ZSI-WRC)
Summary
The freshwater crab genus, Potamiscus Alcock, 1909, of the family Potamidae Ortmann, 1896, is so far known by 18 species from China (Guangxi, Yunnan, and Tibet), Myanmar, and northeastern India (cf. Ng et al, 2008; 2020; Naruse et al, 2018; Mitra and Waikhom, 2019).
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