Abortelphusa namdaphaensis, a new genus and new species of freshwater crab (Decapoda, Brachyura, Gecarcinucidae) from Arunachal Pradesh, India

Abstract

A new genus and species of gecarcinucid crab are described here from the Namdapha Tiger Reserve of Arunachal Pradesh, India; Abortelphusa namdaphaensis gen. et sp. nov. is morphologically distinct from other related genera, like Phricotelphusa Alcock, 1909, Globitelphusa Alcock, 1909, Liotelphusa Alcock, 1909, and in having a discrete suite of characters, i.e., carapace squarish, surface randomly pitted, a wide frontal margin ca. 0.5 times the total carapace width; epigastric cristae rugose, post orbital cristae indiscernible; third maxilliped exopod lacking a flagellum; male pleon narrowly triangular, sixth pleonal somite trapezoidal; terminal segment of male first gonopod subcylindrical, outwardly bent, tip not truncated. The relationship of this new genus and species with other gecarcinucid genera from India is discussed.

Gurumon gurumayum, a new genus and new species of freshwater crab (Decapoda: Brachyura: Potamidae) from Arunachal Pradesh, northeastern India

“…The state of Arunachal Pradesh in northeastern India currently possesses eight genera and 11 species of potamiscine crabs, four genera and five species of potamine crabs, and four genera and four species of gecarcinucid crabs (cf. Mitra et al 2018Pati & Thackeray 2018;Pati et al 2019;Mitra 2020;present study). Some nomenclatural uncertainties with Potamiscus and its type species have been noted recently (Peter Ng, personal communication), which are addressed here.…”

Abormon, a new genus of freshwater crab (Crustacea: Brachyura: Potamidae) from northeastern India, with descriptions of two new species

“…Nauplius, 29: e2021014 introduction The diversity of potamid freshwater crabs in the northeastern region of India (Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim, and Tripura states) is very high and includes all known potamid genera (12 genera) and 29 of the 38 species now known from the country (Wood-Mason, 1871;1875;1876;Henderson, 1893;Rathbun, 1904;1905;Alcock, 1909;1910;Kemp, 1913;Bott, 1966;1970;Dutta, 1983;Ghosh and Ghatak, 1999;2000;Brandis, 2000;Roy et al, 2003;Ghosh et al, 2006;Yeo and Ng, 2007;Takeda et al, 2012;Absar et al, 2017;Mitra, 2017;Mitra et al, 2018;2020;Pati and Thackeray, 2018;Shaw et al, 2018;Mitra and Waikhom, 2019;Pati et al, 2019;2020a;2020b). Of these, three genera and 23 species (nearly 61 % of India's potamid fauna) are endemic to this area (Absar et al, 2017;Mitra, 2017;Mitra et al, 2018;2020;Pati and Thackeray, 2018;Mitra and Waikhom, 2019;Pati et al, 2019;2020a;2020b).…”

“…Many areas of northeastern India, however, remain poorly explored for freshwater crabs, and recent studies have substantially increased the number of known taxa (Absar et al, 2017;Mitra, 2017;2020;Mitra et al, 2018;Mitra and Waikhom, 2019;Pati et al, 2019;2020a;2020b). Despite this, more new taxa await description as many remote localities remain unsurveyed.…”

“…With the present descriptions of the new genus and two new species, Arunachal Pradesh now has 13 species in 10 genera of potamid crabs, and four species and four genera of gecarcinucid crabs (cf. Mitra et al, 2018;Pati and Thackeray, 2018;Pati et al, 2019;Mitra, 2020).…”

Diversity of freshwater crabs (Crustacea: Decapoda: Brachyura) in the Subansiri River basin of Arunachal Pradesh and Assam, northeast India

“…In northeast India, freshwater crabs are the most extensively consumed aquatic species by the various tribal communities, second only to fish, due to their distinct taste, medicinal properties, and aboriginal faith in crab meat. Despite the fact that 44 species of freshwater crabs have been reported in northeast India (Ghosh et al, 2006;Takeda et al, 2012;Mitra, 2017Mitra, , 2020; Pati and Thackeray, 2018; Pati et al, 2019;Mitra et al, 2021;Pati, 2021), there is currently no systematic and evidence-based record of freshwater crab diversity in this region. As a result, the current survey was carried out to contribute to the documentation of freshwater crabs in Arunachal Pradesh and Assam, India's far northeast.…”