Classification
Animalia [kingdom]Arthropoda [phylum]
Crustacea [subphylum]
Malacostraca [class]
Decapoda [order]
Pleocyemata [suborder]
Thoracotremata [infraorder]
Grapsidoidea [superfamily]
Grapsidae [family]
Varuninae [subfamily]
Ptychognathus [genus]
Genus Ptychognathus bevat de volgende taxa:
Ptychognathus altimanus [species]
Ptychognathus barbatus [species]
Ptychognathus capillidigitatus [species]
Ptychognathus glaber [species]
Ptychognathus hachijyoensis [species]
Ptychognathus ishii [species]
Ptychognathus takahasii [species]