Abstract
Two new species of freshwater crab of the genus Potamid Aparapotamon Dai & Chen, 1985 are described from Yunnan Province, southwest China. Morphological comparisons were made between the two new species and type materials of other 11 species of Aparapotamon. Aparapotamonbinchuanensesp. nov. and A.huizeensesp. nov. can be separated from their congeners by the shape of the epibranchial tooth, the frontal view of the cephalothorax, the male first gonopod, and the female vulvae. The molecular analyses based on partial mitochondrial 16S rRNA gene are also included. This study brings the number of Aparapotamon species to 13.
Highlights
Crabs of the family Potamidae Ortmann, 1896 (Crustacea, Decapod, Brachyura) spend their whole life history in freshwater or terrestrial environments (Yeo et al 2008)
The phylogenetic tree in this study included five species of Aparapotamon, and the results showed that they were clustered into one clade (Fig. 10)
Since the two new species cluster with other Aparapotamon species form a separate branch in clade (Fig. 10), the phylogenetic tree supports the assignment of these two new species to Aparapotamon
Summary
Crabs of the family Potamidae Ortmann, 1896 (Crustacea, Decapod, Brachyura) spend their whole life history in freshwater or terrestrial environments (Yeo et al 2008). Yunnan is a possible center of origin for the family Potamidae and is located in the southwest of China (Shih and Ng 2011) It is at the junction of the Asiatic Plate and the Indian Plate (Harrison et al 1992), the geological movement remains active, the complex geographical features of this area have contributed to the rapid differentiation of crabs (Shih et al 2009), so species of this area is richer than that in other places at the same latitude such as Guangxi Zhuang Autonomous Region and Guangdong Province (Shih and Ng 2011)
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