Crabs

Xiphosura (; , in reference to its sword-like telson) is an order of arthropods related to arachnids. They are more commonly known as horseshoe crabs (a name applied more specifically to the only extant family, Limulidae). They first appear in the fossil record in the Early Ordovician, around 480 million years ago. Currently, there are only four living species. Xiphosura contains one suborder, Xiphosurida, and several stem-genera.

is a species of crab native to Japan, with a shell that bears a pattern resembling a human face – an example of the phenomenon of pareidolia – which is interpreted to be the face of an angry samurai, hence the nickname samurai crab. The crabs are named after the once powerful Taira clan which dominated medieval Japan, commonly known as the Heike. It is believed that these crabs are reincarnations of the Heike warriors defeated at the naval Battle of Dan-no-ura as told in The Tale of the Heike. While the crabs are edible, they are not eaten by most Japanese.

Carcinus ( Karkinos) is a genus of crabs, which includes Carcinus maenas, an important invasive species, and C. aestuarii, a species endemic to the Mediterranean Sea.

Raninidae is a family of unusual crabs, sometimes known as "frog crabs", on account of their frog-like appearance. They are taken by most scientists to be quite primitive among the true crabs. They closely resemble the (unrelated) mole crabs, due to parallel evolution or convergent evolution. In both groups, the claws are modified into tools for digging, and the body is a rounded shape that is easy to bury in sand. Unlike most other true crabs, the abdomens of raninids are not curled under the cephalothorax.

Leucosiidae is a family of crabs containing three subfamilies and a number of genera incertae sedis:

species of crab

common name for a non-marine crab

Dorippidae is a small family of crabs, commonly found in the shallow sand and mud substrate in coastal waters. Though common, they don't contribute any economic value and are often discarded as bycatch.

thumb|Porcelain crabs resemble true crabs, but are more closely related to [[squat lobsters and hermit crabs.]]

Hymenosomatidae is a family of crabs with some 110 described species in 24 genera. The following genera are placed in the Hymenosomatidae:

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.

genus of crustaceans

Glyptograpsidae is a family of crabs belonging to the superfamily Grapsoidea.

species of crustacean

thumb|upright=1.35|Cancer pagurus, the edible or brown crab ([[Brachyura)]] Crabs are decapod crustaceans, either the Brachyura (the "true crabs") or various groups within the closely related Anomura (hermit crabs and allies), characterised by having a heavily armoured shell, their tail segments concealed under the body, the ability to run sideways, and the habit of hiding in rocky crevices. They do not form a single natural group or clade, but have convergently evolved multiple times from the ancestral decapod body plan through carcinisation, the process of creating this set of characteristic

The family Palicidae, sometimes called stilt crabs, are a group of crabs. Some genera previously included in this family are now placed in a separate family, the Crossotonotidae.

Ebalia is a genus of crab in the family Leucosiidae.

Corystes cassivelaunus, the masked crab, helmet crab or sand crab, is a burrowing crab of the North Atlantic and North Sea from Portugal to Norway, which also occurs in the Mediterranean Sea. It may grow up to long (carapace length). The name "masked crab" derives from the patterns on the carapace which resemble a human face (a case of pareidolia), in a similar manner to heikegani. It is the only species in the genus Corystes.

Ranina is a genus of crabs belonging to the family Raninidae. It has two extant species.

Hepatus is a genus of crabs in the family Aethridae, containing seven extant species, plus some fossil species: Hepatus chiliensis H. Milne-Edwards, 1837 Hepatus epheliticus (Linnaeus, 1763) Hepatus gronovii Holthuis, 1959 Hepatus kossmanni Neumann, 1878 Hepatus lineatus Rathbun, 1898 Hepatus pudibundus (Herbst, 1785) Hepatus scaber Holthuis, 1959

Ixa is a genus of Indo-Pacific pebble crabs from the family Leucosiidae. The genus was erected by William Elford Leach in 1816. One species, the Red Sea pebble crab (Ixa monodi), is a Lessepsian migrant and the species was first described to science from specimens collected on the Mediterranean Sea although the species is native to the Red Sea and had colonised the eastern Mediterranean through the Suez Canal.

Xenograpsus is a genus of crustaceans belonging to the monotypic family Xenograpsidae.

Coleusia is a genus of Indo-Pacific pebble crabs of the family Leucosiidae. The six species currently recognised were formerly classed within the genus Leucosia. They were separated into Coleusia in 2006 based on the fusion of segments 3-5 on the abdomens of the males and the three times axial coiling of the shaft of the first pleopod, which bears a tufted lobe on its distal portion and an elongated apical process.

species of crustacean

species of crustacean

species of crustacean

Pseudoziidae is a family of crustaceans belonging to superfamily Pseudozioidea in the order Decapoda.

species of crustacean

species of crab

Daldorfia is a genus of parthenopid crab, belonging to the subfamily Daldorfiinae.

genus of crabs

Actaeomorpha is a genus of crabs in the family Aethridae, containing the following species: Actaeomorpha alvae Boone, 1934 Actaeomorpha erosa Miers, 1877 Actaeomorpha punctata Edmondson, 1935 Actaeomorpha angulata Ihle, 1918 Actaeomorpha lapillula Alcock, 1896 Actaeomorpha morum Alcock, 1896

Persephona is a genus of true crabs in the family Leucosiidae. There are about 5 described species in Persephona.

Heterozius rotundifrons, or big hand crab, is a species of crab of the family Belliidae, endemic to New Zealand. The carapace width is up to .

Palicus is a genus of stilt crabs in the family Palicidae.

genus of crustaceans

Randallia is a genus of true crabs in the family Leucosiidae. There are about 17 described species in Randallia.

Lyreidus is a genus of crabs in the family Raninidae, containing the following species: Lyreidus brevifrons Sakai, 1937 Lyreidus stenops Wood-Mason, 1887 Lyreidus tridentatus de Haan, 1841

Gandalfus is a genus of crabs belonging to the family Bythograeidae. Gandalfus species occur around hydrothermal vents.

Planopilumnidae is a family of crabs belonging to the superfamily Pseudozioidea.

species of crustacean

Eucrate is a genus of crabs of the family Euryplacidae containing the following species:

species of crustacean

species of crustacean

species of crustacean

Tetraliidae is a family of crabs.

Dacryopilumnus is a genus of crabs belonging to the monotypic family Dacryopilumnidae.

Hexapus is a genus of crabs in the family Hexapodidae. It contains only three extant species found in the Indo-West Pacific. They inhabit the intertidal and subtidal areas of shorelines.

Neotroglocarcinus is a genus of crabs belonging to the family Cryptochiridae.

Elamena is a genus of crab, containing 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.

Domeciidae is a family of crabs.

genus of Malacostraca

genus of crustaceans

Bellia picta is a species of crab that lives around the coasts of South America, and the only species in the genus Bellia. On the Atlantic coast, it is found in Rio Grande do Sul, Brazil, while on the Pacific coast, it is found off Peru and Chile. It probably lives in burrows and is a filter feeder.

Osachila is a genus of crabs in the family Aethridae, containing three fossil species, and the following extant species: Osachila acuta Stimpson, 1871 Osachila antillensis Rathbun, 1916 Osachila expansa Takeda, 1977 Osachila galapagensis Rathbun, 1935 Osachila kaiserae Zimmerman & Martin, 1999 Osachila lata Faxon, 1893 Osachila levis Rathbun, 1898 Osachila semilevis Rathbun, 1916 Osachila sona Garth, 1940 Osachila stimpsonii Studer, 1883 Osachila tuberosa Stimpson, 1871

species of crustacean

Clythrocerus is a genus of brachyuran crab known from the Gulf of Mexico and western portions of the Atlantic Ocean. It currently includes four species: C. stimpsoni, C. granulatus, C. perpusillus, and C. nitidus.

species of crustacean

genus of crustaceans