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Mictyris is a genus of brightly coloured crabs, placed in its own taxonomical family, the Mictyridae. It inhabits the central Indo-West Pacific region. These crabs congregate on mud flats or beaches in groups of a few thousand, and filter sand or mud for microscopic organisms. They congregate during low tide, and bury themselves in the sand during high tide or whenever they are threatened. This is done in wet sand, and they dig in a corkscrew pattern, leaving many small round pellets of sand behind them.
The Ocypodidae are a family of semiterrestrial crabs that includes the ghost crabs and fiddler crabs. They are found on tropical and temperate shorelines around the world.
The graceful rock crab or slender crab, Metacarcinus gracilis or Cancer gracilis, is one of only two members of the genus Metacarcinus, recognized by WoRMS, whose chelae (claws) are white tipped, the other crab being M. magister. Both of these eastern Pacific crab species are recognized by ITIS as belonging to the much larger genus Cancer. M. gracilis has been caught from Alaska to Bahía Magdelena, Baja California. Although M. gracilis is only found in the Pacific Ocean, it has cousins in the Atlantic Ocean. The genus Cancer apparently evolved in the Pacific Ocean and later migrated to the Atlantic Ocean. Larvae and small juveniles of this species are often seen riding jellyfish, especially Phacellophora camtschatica. The juvenile crabs steal food from the jellyfish and also clean off parasitic amphipods.
Cryptochiridae is a family of crabs known commonly as gall crabs or coral gall crabs. They live inside dwellings in corals and cause the formation of galls in the coral structure. The family is currently placed in its own superfamily, Cryptochiroidea.
The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms.
Eriphia is a genus of crabs, including the following species:
Dromia is a genus of crabs in the family Dromiidae. It contains 6 extant species:
Trapeziidae is a family of crabs, commonly known as coral crabs. All the species in the family are found in a close symbiosis with cnidarians. They are found across the Indo-Pacific, and can best be identified to the species level by the colour patterns they display. Members of the family Tetraliidae were previously included in the Trapeziidae, but the similarities between the taxa is the result of convergent evolution.
Macropodia is a genus of crabs, belonging to the family Inachidae. It contains the following species:
Acanthonyx dentatus, the toothed decorator crab, is a species of crab in the family Inachidae.
Liocarcinus navigator is a species of crab in the family Portunidae.
Hippa is a genus of decapod crustaceans in the family Hippidae, containing the following species:
The Macrophthalmidae are a family of crabs, comprising these subfamilies and genera:
Goneplax is a genus of crabs, containing the following extant species:
Hoplophrys is a monotypic genus of crab in the family Epialtidae. It contains the single species Hoplophrys oatesi, also known as the candy crab, Oates's soft coral crab, commensal soft coral crab and Dendronephthya crab.
Calappa gallus, common name rough box crab, or lumpy box crab, and Hawaiian name poki poki, is a benthic species of box crab in the family Calappidae.
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 revealed to be a junior homonym of the gastropod genus Heikea, erected by Orvar Isberg in 1934.
Hirsutodynomene is a genus of crabs in the family Dynomenidae. All species in this genus except the newest one belonged to the genus Dynomene. These two genera form the subfamilia Dynomeninae. The type species of this genus is: Dynomene spinosa(Rathbun, 1911).
Tunicotheres is a monotypic genus of crabs in the family Pinnotheridae, and Tunicotheres moseri is the only species in the genus. This crab lives commensally in the atrial chamber of a small ascidian. It is found in the tropical western Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico.
Austruca is a genus of indo-west Pacific fiddler crabs in the family Ocypodidae. There are about 13 described species in this genus.
References
- ↑ Peter K. L. Ng; Danièle Guinot & Peter J. F. Davie (2008). "Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world" (PDF). Raffles Bulletin of Zoology . 17: 1–286. Archived from the original (PDF) on 2011-06-06.
- ↑ WoRMS (2018) "WoRMS (2018). Epigrapsus Heller, 1862.", World Registry of Marine Species , 2018. Retrieved on 2018-07-23.
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