Tayninhon nuibaden, a new genus and new species of freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from Ba Den Mountain, Southeast Vietnam

Recent surveys in Ba Den Mountain, Southeast Vietnam, found one new genus and species of the potamid, Tayninhon nuibaden gen. nov., sp. nov. The new genus is characterised by its medium adult carapace size, relatively flat, rugose and striae on the carapace dorsal surface, low epigastric, postorbital cristae and epibranchial tooth; the anterolateral margin is serrated; relatively wide thoracic sternum with smooth surface; sternopleonal cavity reaching to the imaginary line connecting anterior edges of cheliped coxae; relatively narrow telson; the male first gonopod is sinuous with relatively broad subterminal segment, and the terminal segment hook-shaped with a fold at the basal part, distal part curved inwards, tip sharp; and the male second gonopod is relatively short. The present study brings the total number of freshwater crab species belonging to Potamidae in Vietnam to 61.