Percnon is a genus of crabs in the family Percnidae. It has also been included in the family Plagusiidae as subfamily Percninae.
Species Seven extant species are recognised: Percnon abbreviatum (Dana, 1851); Percnon affine (Milne-Edwards, 1853); Percnon gibbesi (Milne-Edwards, 1853); Percnon guinotae Crosnier, 1965; Percnon pascuensis Retamal, 2002; Percnon planissimum (Herbst, 1804); Percnon sinense Chen, 1977.
There are two species only known from fossils: †Percnon paleogenicus De Angeli, 2023; †Percnon santurbanensis Ceccon & De Angeli, 2019.
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