Pinnotheridae is a family of tiny soft-bodied crabs that live commensally in the mantles of certain bivalve molluscs and the occasional large gastropod mollusc species in genera such as Strombus and Haliotis. Tunicotheres moseri is commensal with a tunicate. The earliest fossils attributable to the Pinnotheridae date from the Danian.
Callianassa is a genus of mud shrimps, in the family Callianassidae. Three of the species in this genus have been split off into a new genus, Pestarella, while others such as Callianassa filholi have been moved to Biffarius. The genus is named after the Nereid of the Greco-Roman mythology.
Thalassina is a genus of mud lobsters found in the mangrove swamps of the Indian Ocean and western Pacific Ocean. Its nocturnal burrowing is important for the recycling of nutrients in the mangrove ecosystem, although it is sometimes considered a pest of fish and prawn farms.
The Aethridae are a family of crabs in their own superfamily, Aethroidea. It contains these genera :
Hexapodidae is a family of crabs, the only family in the superfamily Hexapodoidea. It has traditionally been treated as a subfamily of the family Goneplacidae, and was originally described as a subfamily of Pinnotheridae. Its members can be distinguished from all other true crabs by the reduction of the thorax, such that only seven sternites are exposed, and only four pairs of pereiopods are present. Not counting the enlarged pair of claws, this leaves only six walking legs, from which the type genus Hexapus, and therefore the whole family, takes its name. Some anomuran "crabs", such as porcelain crabs and king crabs also have only four visible pairs of legs. With the exception of Stevea williamsi, from Mexico, all the extant members are found either in the Indo-Pacific oceans, or around the coast of Africa.
Neotrypaea is a genus of ghost shrimp in the family Callianassidae, containing the following sixteen species:
Macropodia is a genus of crabs, belonging to the family Inachidae. It contains the following species:
Acanthonyx is a genus of crabs, in the family Epialtidae, which was first described in 1828 by. The type species is Acanthonyx lunulatus.
Paramedaeus is a genus of crabs in the family Xanthidae, containing the following species:
Neoliomera is a genus of crabs in the family Xanthidae, containing the following species:
Hippa is a genus of decapod crustaceans in the family Hippidae, containing the following species:
Achaeus is a genus of crabs comprising the following species:
Heikeopsis is a genus of crabs containing two species, Heikeopsis japonica and Heikeopsis arachnoides. The genus was originally described under the name "Heikea" by Lipke Holthuis and Raymond B. Manning in 1990, but was later determined to be a junior homonym of the gastropod genus Heikea, erected by Orvar Isberg in 1934.
Geryonidae is a family of crabs, including the following subfamilies and genera:
Chaceon crosnieri is a species of crab.
Bathynectes is a genus of crabs in the family Polybiidae.
The Camptandriidae are a family of crabs, with 38 species in 21 genera:
Chaceon is a crab genus in the family Geryonidae, and was first described in 1989 by Raymond Manning and Lipke Holthuis.
Heikeopsis arachnoides is a species of the genus Heikeopsis first described by Manning and Holthuis in 1986. These crabs are native to Japan. They typically live in the sand 15-130m below the surface of water. Heikeopsis arachnoides also lives in Taiwan.
Oratosquilla is a genus of crustaceans belonging to the family Squillidae. The species of this genus are found in Indo-West-Pacific. The genus was first described in 1968 by Raymond Brendan Manning.
