Afrithelphusa is a genus of freshwater crabs in the family Deckeniidae. It contains four species, all of which were formerly listed as critically endangered by the International Union for Conservation of Nature (IUCN). They are all endemic to the Upper Guinean forests of Guinea and Sierra Leone.
Ceylonthelphusa is a genus of freshwater crabs endemic to Sri Lanka, where they live in moist lowland forests, swamps and rivers. Many of the species are on the IUCN Red List of threatened species, with the greatest risk factor being habitat loss. Ceylonthelphusa contains these species:
Louisea is a genus of freshwater crab in the family Potamonautidae, containing two species, Louisea balssi and Louisea edeaensis. Both species are endemic to Cameroon and listed as endangered species on the IUCN Red List.
Mahatha is a genus of freshwater crabs endemic to Sri Lanka. Four of the six species are critically endangered due to habitat loss, and two are listed as Least Concern on the IUCN Red List.
Oziotelphusa is a genus of freshwater crabs in the family Gecarcinucidae. Its members are found in Sri Lanka and southern India. The genus was formerly placed within family Parathelphusidae, but now it is accepted that Parathelphusidae is the junior synonym of Gecarcinucidae.
Perbrinckia is a genus of freshwater crabs of the family Gecarcinucidae that is endemic to Sri Lanka, named after Per Brinck. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical swamps, and rivers. It contains 14 species, most of which are included on the IUCN Red List as critically endangered species (CR) or vulnerable species (VU) because they are threatened by habitat loss; only one species is of least concern (LC).
Platythelphusa is a genus of freshwater crabs endemic to Lake Tanganyika. It has been placed in a number of families, including a monotypic family, Platythelphusidae, as well as Potamidae and its current position in the Potamonautidae, and has also been treated as a subgenus of Potamonautes. It forms a monophyletic group, possibly nested within the genus Potamonautes, which would therefore be paraphyletic. The genus is the only evolutionary radiation of crabs to have occurred in a freshwater lake, and it occurred recently, probably since the Pliocene. This parallels the better known radiation of cichlid fishes in Lake Tanganyika. Only one other species of freshwater crab is found in Lake Tanganyika, Potamonautes platynotus.
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:
Deckenia is a genus of freshwater crabs from East Africa, in the family Potamonautidae, or sometimes in a family of its own, Deckeniidae. The genus was named by Hilgendorf after Karl Klaus von der Decken who collected the first examples during his expeditions to Africa. Both species live in swamps from Eyl in Somalia to Dar es Salaam, Tanzania, both in coastal areas and further inland. A third species, Deckenia alluaudi, lives in the Seychelles, and has been transferred to a separate genus, Seychellum.
Smalleyus is a genus of crabs in the family Pseudothelphusidae, containing the single species Smalleyus tricristatus.
Brasiliothelphusa tapajoensis is a species of freshwater crabs in the family Pseudothelphusidae, and the only species in the genus Brasiliothelphusa. It was described in 1986 from specimens caught in the Rio Tapajós in the state of Pará, Brazil. It is listed as Data Deficient on the IUCN Red List.
Neoepilobocera gertraudae is a species of cave-dwelling crab from Cuba.
Achlidon agrestis is a species of crab in the family Pseudothelphusidae, and the only species in the genus Achlidon. It lives in rivers in Mexico and Costa Rica.
Camptophallus botti is a species of crab in the family Pseudothelphusidae, and the only species in the genus Camptophallus. It is endemic to the Nicaraguan departments of Matagalpa and Jinotega.
Eidocamptophallus chacei is a species of crab in the family Pseudothelphusidae, and the only species in the genus Eidocamptophallus.
Lobithelphusa mexicana is a species of crab in the family Pseudothelphusidae, the only species in the genus Lobithelphusa.
Martiana clausa is a species of crab in the family Pseudothelphusidae, the only species in the genus Martiana.
Oedothelphusa is a genus of crabs in the family Pseudothelphusidae, containing the single species Oedothelphusa orientalis. It is known from a single site at an altitude of 1,210 metres (3,970 ft) in Monagas state, Venezuela.
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.
Johora thaiana is a species of freshwater crab described from specimens found in Thailand, as the name was derived. Most species in this genus are found in Singapore and Peninsular Malaysia so this is the most northern species of the genus. The crab is completely aquatic and can be found under rocks or vegetation in flowing streams and adjacent pools. However, they tend to inhabit sheltered habitats with slower water. They are active more at night.
