The systematic position of Cryptopotamon anacoluthon (Kemp, 1918), with the description of a new species of Sinolapotamon Tai & Sung, 1975 (Crustacea, Decapoda, Brachyura, Potamidae) from southern China

The systematics of the potamid freshwater crab Cryptopotamon anacoluthon (Kemp, 1918) is clarified, and its generic position in Sinolapotamon Tai & Sung, 1975, is con-firmed based on morphological comparisons, geographical information and phyloge- netic analyses. A new species of Sinolapotamon, Sinolapotamon cirratum sp. nov. is described from the Guangxi Zhuang Autonomous Region of China. Sinolapotamon cir-ratum sp. nov. is distinguished from its congeners by the combination of characters of its carapace, third maxilliped, anterolateral margin, and unique male first gonopod. Phy- logenetic analyses based on partial COX1, 16S rRNA and 28S rRNA genes also support the species as new.

Automated summary

The taxonomic status of the freshwater crab Cryptopotamon anacoluthon is clarified, confirming its position in the genus Sinolapotamon through morphological comparisons, geographical information, and phylogenetic analysis. A new species of Sinolapotamon, Sinolapotamon cirratum sp. nov., is described from Guangxi Zhuang Autonomous Region, China. This new species is distinguished from its relatives by a unique combination of characters in its carapace, third maxilliped, anterolateral margin, and male first gonopod. Phylogenetic analysis using partial COX1, 16S rRNA, and 28S rRNA genes also supports its status as a new species.