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.
Libystes is a genus of crabs, containing six species:
Parathranites is a genus of crabs. It contains the following species:
Macrophthalmus is a genus of crabs which are widespread across the Indo-Pacific. It contains the following species :
Belliidae is a family of crabs of the order Decapoda.
Potamonautes is a genus of African freshwater crabs in the family Potamonautidae. It is both the most widespread and most diverse genus of African freshwater crabs, including more than half the species of this continent. They are found in most freshwater habitats of the African mainland and some species are semi-terrestrial.
Gecarcinucoidea is a superfamily of freshwater crabs. Its members have been grouped into families in various ways, with some authors recognising families such as "Deckeniidae", "Sundathelphusidae", but only two families are currently recognised: Gecarcinucidae and Parathelphusidae.
Dakoticancroidea is a superfamily of fossil crabs, containing six species in five genera, divided into two families. The family Dakoticancridae is only known from North American rocks of Late Cretaceous age, while the single species in the Ibericancridae was found in Spain.
Etisus is a genus of crabs, containing the following extant species:
Hyas is a genus of oregoniid crabs, comprising five extant species:
Ptychophallus is a genus of crabs in the family Pseudothelphusidae.
Cymo is a genus of crabs in the family Xanthidae, containing the following species:
Euxanthus is a genus of crabs in the family Xanthidae, containing the following species:
Liomera is a genus of crabs in the family Xanthidae, containing the following species:
Monodaeus is a genus of crabs in the family Xanthidae, containing the following species:
Garthiope is a genus of crabs in the family Xanthidae, containing the following species:
Gonopanope is a genus of crabs in the family Xanthidae, containing the following species:
Banareia is a genus of crabs in the family Xanthidae, containing the following species:
Inachoididae is a family of crabs originally erected by James Dwight Dana in 1852. It was not recognised as a valid family until the early 1980s. Its members closely resemble those of the family Inachidae, and the Inachoididae could be recognised as a subfamily of that family.
Mathildellidae is family of crabs belonging to the superfamily Goneplacoidea, containing the following genera:
