Description of two new species of the genus Heterochelamon Türkay & Dai, 1997 (Crustacea: Decapoda: Brachyura: Potamidae), from southern China

Abstract

This study describes two new species of freshwater crab of the genus Heterochelamon Türkay & Dai, 1997 from southern China, H. huidongense from Guangdong Province and H. jinxiuense from Guangxi Zhuang Autonomous Region. The two new species can be differentiated from congeners by characters derived from the shape of the epibranchial tooth, external orbital angle, cheliped proportions and structure of the male first gonopod. The present study brings the number of Heterochelamon species to seven. We used the mitochondrial 16S rRNA gene for a molecular analysis and the results are consistent with the morphological features that support the recognition of two new taxa.

Two new species of freshwater crab of the genus Aparapotamon Dai & Chen, 1985 (Crustacea, Brachyura, Potamidae) from Yunnan, China

“…2018a ). Despite this substantial diversity, the rate of discovery remains high ( Chu et al 2018b ; Huang et al 2018a , b , 2020a , b ; Naruse et al 2018 ; Zou et al 2018 ; Gao et al 2019 ; Wang et al 2019a , b , 2020a , b ; Mao and Huang 2020 ). With the two new species described in this study, Yunnan has a total of 18 genera and 67 species, highest among all provinces in China ( Chu et al 2018a ; Wang et al 2020 ).…”

The second known stygomorphic freshwater crab from China, Phasmon typhlops gen. nov. et sp. nov. (Crustacea, Decapoda, Potamidae), diverged at the beginning of the Late Miocene

“…With 14 genera recorded to date (Bottapotamon Türkay & Dai, 1997, Chinapotamon Dai & Naiyanetr, 1994, Heterochelamon Türkay & Dai, 1997, Indochinamon Yeo & Ng, 2007, Lacunipotamon Dai, Song, He, Cao, Xu & Zhong, 1975, Longpotamon Shih, Huang & Ng, 2016, Mediapotamon Türkay & Dai, 1997, Neilupotamon Dai & Türkay, 1997, Potamiscus Alcock, 1909, Qianguimon Huang, 2018, Sinolapotamon Tai & Sung, 1975, Somanniathelphusa Bott, 1968, Tiwaripotamon Bott, 1970, and Yarepotamon Dai & Türkay, 1997, Guangxi Zhuang Autonomous Region is second, in China, only to Yunnan Province in the number of freshwater crab genera (Shih and Ng 2011;Huang 2018;Huang et al 2020d). From the number of new species described from this region in recent years (Zhu et al 2010;Naruse et al 2013;Do et al 2016;Ng 2017;Huang 2018;Zou et al 2018;Wang et al 2019Wang et al , 2020a, there is little doubt that many more remain to be discovered.…”