Abstract

The taxonomy of three freshwater crabs from Hong Kong is discussed. Two poorly known potamid species, Potamon anacoluthon Kemp, 1918, and Potamon hongkongensis Shen, 1940, are referred to Cryptopotamon, gen. nov., and Nanhaipotamon Bott, 1968, respectively. The taxonomic problems associated with the genus Nanhaipotamon are briefly reviewed. The identity of the parathelphusid Somanniathelphusa sinensis (H. Milne Edwards, 1853) is clarified on re-examination of the types, and two new species, S. falx (from China) and S. zanklon (from Hong Kong), are described. Notes on the general biology of the three Hong Kong species are also provided.