Hainanpotamon vietnamicum is a species of crab. Originally described as a species of Geothelphusa, it is now treated as part of the genus Hainanpotamon, although it has also been suggested as a member of Tiwaripotamon. It is only known from a single locality in Cúc Phương National Park, Ninh Bình Province, Vietnam. References Potamoidea Freshwater crustaceans of Asia Arthropods of Vietnam Endemic fauna of Vietnam Crustaceans described in 2002 Taxobox binomials not recognized by IUCN