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| Ptychophallus | |
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| Genus: | Ptychophallus Smalley, 1964 |
| Type species | |
| Pseudothelphusa tristani Rathbun, 1896 | |
Ptychophallus is a genus of crabs in the family Pseudothelphusidae. [1]
Xanthidae is a family of crabs known as gorilla crabs, mud crabs, pebble crabs or rubble crabs. Xanthid crabs are often brightly coloured and are highly poisonous, containing toxins which are not destroyed by cooking and for which no antidote is known. The toxins are similar to the tetrodotoxin and saxitoxin produced by puffer fish, and may be produced by bacteria in the genus Vibrio living in symbiosis with the crabs, mostly V. alginolyticus and V. parahaemolyticus.
Pseudothelphusidae is a family of freshwater crabs found chiefly in mountain streams in the Neotropics. They are believed to have originated in the Greater Antilles and then crossed to Central America via a Pliocene land bridge.
Potamon is a genus of freshwater or semiterrestrial crabs mainly found from Southern Europe through the Middle East, and as far east as north-western India. The only exception is the North African P. algeriense, which also is the only potamid of mainland Africa. Twenty species are currently recognised:. These crabs are omnivores that have a broad ecological tolerance. The adult Potaman reach up to 50 mm in size during their 10-12 year life span.
Neostrengeria is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Potamocarcinus is a genus of crabs in the family Pseudothelphusidae.
Pseudothelphusa is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Fredius is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Epilobocera is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Chaceus is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Hypolobocera is a genus of crabs in the family Pseudothelphusidae, found only in the San Juan River basin which drains into the Pacific, in Colombia. The major and future threats to this species include human-induced habitat loss/degradation and water pollution.
Microthelphusa is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Moritschus is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Neopseudothelphusa is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Spirothelphusa is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Strengeriana is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Tehuana is a genus of crabs in the family Pseudothelphusidae, containing the following species:
Micropanope is a genus of crabs in the family Xanthidae, containing one exclusively fossil species and the following species:
Seychellum alluaudi is a species of freshwater crab endemic to the Seychelles, and the only true freshwater crab in that country. It lives in rainforest streams on the archipelago's granitic high islands. Although it may be abundant, little is known about its biology. If its habitat were to decline in quality, S. alluaudi might become endangered, but it is currently listed as Vulnerable on the IUCN Red List.
Pisinae is a subfamily of crabs in the family Epialtidae, comprising the following genera:
Pyromaia is a genus of crab in the family Inachoididae, containing the following species:
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