Two new species of freshwater crabs of the genera Eosamon Yeo & Ng, 2007 and Indochinamon Yeo & Ng, 2007 (Crustacea, Brachyura, Potamidae) from southern Yunnan, China

Abstract

Two new species of potamid crabs, Eosamon daiaesp. nov. and Indochinamon malipoensesp. nov. are described from the Sino-Burmese border, southwestern Yunnan and from the Sino-Vietnamese border, southeastern Yunnan, China. The two new species can be distinguished from their closest congeners by several characters, among which is the form of the first gonopod structures. Molecular analyses based on partial mitochondrial 16S rDNA sequences also support the systematic status of these new taxa.

Mitogenome phylogeny reveals Indochina Peninsula origin and spatiotemporal diversification of freshwater crabs (Potamidae: Potamiscinae) in China

“…Indochinamon is an enigmatic genus with 39 described species that are widely distributed in northeastern India, the Indochinese Peninsula, and southwestern China (Yeo and Ng, 2007; Chu et al., 2018; Naruse et al., 2018; Zhang et al., 2020a). Our results suggest that Indochinamon is not monophyletic because two other genera ( Eosamon and Iomon ) are nested within it.…”

“…The vast majority of species of potamiscine freshwater crabs are found in China, where there are more than 318 species in 52 genera known to date, rendering China the country with the highest species richness of freshwater crabs in the world (Chu et al., 2018; Cumberlidge et al., 2011). New taxa in China are still being described at a rapid rate as exploration of freshwater habitats increases (e.g., Naruse et al., 2018; Huang et al., 2020a,b; Wang et al., 2020; Zhang et al., 2020a). One striking feature of the Chinese potamiscine freshwater crab fauna is its high rate of endemism with more than 95% of its species and more than 85% of its genera occurring exclusively in China (Chu et al., 2018).…”

A taxonomic revision of the freshwater crab genus Parvuspotamon Dai & Bo, 1994 (Decapoda, Brachyura, Potamidae), with descriptions of a new genus and two new species

“…Yunnan is a centre of diversification for Chinese freshwater crabs ( Dai 1999 ; Cumberlidge et al 2011 ). Although extensive research has been conducted on freshwater crabs in this region, the discovery of new genera and species still continues, and many new taxa have recently been revealed through morphological and molecular studies ( Chu et al 2017 , 2018a , b ; Naruse et al 2018 ; Huang et al 2020a , b ; Wang et al 2020 ; Zhang et al 2020 ; Pan et al 2021a , b , 2023 ; Tan et al 2021 ; Shi et al 2022 ). This is partly attributed to ongoing efforts focused on previously under-sampled areas.…”

A new species of <i>Eosamon</i> (Crustacea, Brachyura, Potamidae) described from Bokor, Cambodia

“…Twelve species were recognised from western China and Indochina (Yeo & Ng, 2007;Yeo, 2010;Zhang et al, 2020) although Yeo & Ng (2007: 282) noted that several Chinese species included appeared morphologically different. Consequently, Pan et al (2020) Pan et al (2022) noted that the taxa in this genus have distinctly broader male pleons, this character is also shared by some Indochinese Eosamon s. str. species, e.g., E. phuphanense, E. yotdomense and E. cambodiense (Fig.…”