Four species of freshwater crabs from three genera and two families ( Huang, Ahyong & Shih, 2017, Dai, 1997, , and Ng & Dudgeon, 1992) are documented from Macau for the first time. One new species, , is described. The large flap on the male first gonopod terminal segment sets it apart from all other known congeners except Cheng, Yang, Zhong & Li, 2003, from Fujian. Characters of the carapace, male first gonopod and size, however, clearly differentiate these two species. Preliminary genetic studies also suggest that the two are not closely related. A neotype is designated for . The taxonomic status of is also discussed. Notes on the general biology and conservation status of these crabs are also included.
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