The freshwater crabs of Danum Valley Conservation Area in Sabah, East Malaysia, with a description of a new species of Thelphusula Bott, 1969 (Crustacea, Brachyura, Gecarcinucidae, Potamidae, Sesarmidae)

Seven species of freshwater crabs from three families are recorded from and around the Danum Valley Conservation Area in Sabah, Malaysian Borneo: , Ng & Stuebing, 1990, Ng, 1991, Ng & Tan, 2015, Ng & Goh, 1987 (new record) (Gecarcinucidae); Ng & Tan, 1998 (Potamidae); and Ng, 2002 (Sesarmidae). The new species of Bott, 1979, can be distinguished from all congeners by a unique combination of morphological features, most notably the presence of dense patches of short setae on the fingers of the adult male chelipeds, as well as the structure of the male first gonopod. is confirmed to be a phytotelm species. A key to all species in the conservation area is provided.