Potamoidea is a superfamily of freshwater crabs, comprising the two families Potamidae and Potamonautidae. Two previously recognised families, Deckeniidae and Platythelphusidae, are now treated as parts of the family Potamonautidae.
Xanthoidea is a superfamily of crabs, comprising the three families Xanthidae, Panopeidae and Pseudorhombilidae. Formerly, a number of other families were included in Xanthoidea, but many of these have since been removed to other superfamilies. These include Carpilioidea, Eriphioidea, Hexapodoidea, Pilumnoidea and Trapezioidea. Even in this reduced state, Xanthoidea remains one of the most species-rich superfamilies of crabs.
Spiralothelphusa is a genus of freshwater crabs in the family Gecarcinucidae. It contains these species, all of which are included on the IUCN Red List:
Gecarcinucoidea is a superfamily of freshwater crabs. Its members have been grouped into families in various ways, with some authors recognizing families such as "Deckeniidae", "Sundathelphusidae", and "Parathelphusidae", but now only the family Gecarcinucidae is currently recognized.
The Gecarcinucidae are a family of true freshwater crabs. They are found throughout South Asia, Southeast Asia and New Guinea, with a single genus found in Australia.
Somanniathelphusa is a genus of freshwater crabs found in southeast China, Taiwan, and southeast Asia. It includes the following species:
Scylla is a genus of swimming crabs, comprising four species, of which S. serrata is the most widespread. They are found across the Indo-West Pacific. The four species are:
Scleroplax granulata is a species of crab in the family Pinnotheridae.
Prionothelphusa is a genus of freshwater crabs in the family Pseudothelphusidae, containing the single species Prionothelphusa eliasi. It lives in Colombia, Venezuela and Brazil in the drainages of the Rio Negro river draining the Guyana Shield, and is listed as Least Concern on the IUCN Red List.
Villalobosius is a genus of crabs in the family Pseudothelphusidae, containing a single species, Villalobosius lopezformenti. It lives in the northern part of the state of Oaxaca, Mexico, on the Isthmus of Tehuantepec, and is adapted to a troglobitic lifestyle.
Medaeops is a genus of crabs in the family Xanthidae, containing the following species:
Paramedaeus is a genus of crabs in the family Xanthidae, containing the following species:
Paractaeopsis quadriareolata is a species of crabs in the family Xanthidae, the only species in the genus Paractaeopsis.
Sulcodius deflexus is a species of crabs in the family Xanthidae, the only species in the genus Sulcodius.
Pleurocolpus boileaui is a species of crabs in the family Xanthidae, the only species in the genus Pleurocolpus.
Garthasia americana is a species of crabs in the family Xanthidae, the only species in the genus Garthasia.
Eucratodes agassizii is a species of crabs in the family Xanthidae, the only species in the genus Eucratodes.
Metaxanthops acutus is a species of crabs in the family Xanthidae, the only species in the genus Metaxanthops.
Paraxanthodes is a genus of crabs in the family Xanthidae, containing the following species:
Pulcratis reticulatus is a species of crabs in the family Xanthidae, the only species in the genus Pulcratis.
