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A new freshwater crab species of the family Potamidae is described from the boundaries of northern Vietnam and southern China. Tiwaripotamon pluviosum sp. nov. can be distinguished from other species by a suite of morphological characters, including a relatively flat carapace, relatively less slender legs, and distinct dorsal flaps on the male first gonopods. Molecular data using the mitochondrial cytochrome oxidase subunit I (COI) also supports this species as being new. [ABSTRACT FROM AUTHOR]

A new species of potamid freshwater crab, Indochinamon chuahuong, is described from Ha Noi, northern Vietnam. The new species can be distinguished from all other Indochinamon species by a suite of characters, including a carapace broader than long; an anterolateral margin that is convex and distinctly serrated; longer ambulatory legs than its congeners; and the terminal segment of the male first gonopod being curved outwards, with a very low dorsal flap. [ABSTRACT FROM AUTHOR]