Sunday, July 16, 2017

[Crustacea • 2017] Arquatopotamon jizushanense • A New Genus and New Species of Freshwater Crab (Decapoda: Brachyura: Potamidae Ortmann, 1896) from Yunnan Province, China


Arquatopotamon jizushanense
 Chu, Zhou & Sun, 2017


Abstract

A new genus Arquatopotamon gen. n. of the family Potamidae Ortmann, 1896, is established and a new species, Arquatopotamon jizushanense sp. n. from Yunnan Province, China is described. The new genus is established based on the distinctive distal part of the male first gonopod, with arched-shaped subterminal and terminal segments (in mesioventral view) and female gonopores (vulvae) on thoracic sternites 5/6 and a combination of characters including the carapace and male telson, while it is similar to the five known genera in Yunnan Province and adjacent area, Tenuipotamon Dai, 1990Pararanguna Dai & Chen, 1985Trichopotamon Dai & Chen, 1985Potamiscus Alcock, 1909 and Aparapotamon Dai & Chen, 1985, in having a third maxilliped exopod without a flagellum. Present molecular data based on a barcoding marker of 16S rDNA provide strong support for the genus as being new.

Keywords: Crustacea, new genus, new species, taxonomy


Coloration in life of male Arquatopotamon jizushanense gen. n., sp. n. 

Systematics 
Family Potamidae Ortmann, 1896 

Arquatopotamon gen. n.
Type species. Arquatopotamon jizushanense sp. n., by monotypy. 

Etymology. The genus name is derived from the Latin arquatus for “arched”, which describes the arched male first gonopod of the type species for the genus. Potamon is the type genus of the family Potamidae. Gender neuter.

Arquatopotamon jizushanense sp. n. 

Distribution and habitat. Arquatopotamon jizushanense gen. n., sp. n. was found under stones in small hill streams in ...village, Jizushan Town, Binchuan County, Dali City in Yunnan Province, China; at an altitude of 1778 m. No other potamids were observed at the type locality. 

Live coloration. Carapace is usually dark brown, whereas chelipeds and ambulatory legs are reddish brown to purple in life. 

Etymology. Arquatopotamon jizushanense gen. n., sp. n. is named after the type locality, Jizushan Town in Yunnan Province, China.


Kelin Chu, Lijun Zhou and Hongying Sun. 2017.  A New Genus and New Species of Freshwater Crab (Decapoda: Brachyura: Potamidae Ortmann, 1896) from Yunnan Province, China. Zootaxa. 4286(2);241–253. DOI:  10.11646/zootaxa.4286.2.7

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