Tags: Crustacean.
Platythelphusa is a genus of freshwater crabs endemic to Lake Tanganyika. It has been placed in a number of families including a monotypic family Platythelphusidae as well as Potamidae and its current position in the Potamonautidae and has also been treated as a subgenus of Potamonautes. It forms a monophyletic group possibly nested within the genus Potamonautes which would therefore be paraphyletic.