Grapsoidea

species of crustacean

Gecarcinidae, or land crabs, are a family of true crabs that are adapted for terrestrial existence. Similar to all other crabs, land crabs possess a series of gills. In addition, the area of the carapace covering the gills is inflated and equipped with extra blood vessels. These organs extract oxygen from the air, analogous to the vertebrate lungs. These are called branchiostegal lungs. Adult land crabs are terrestrial, but visit the sea periodically, where they breed and their larvae develop. Land crabs are tropical omnivores which sometimes cause considerable damage to crops. Most land crabs

species of crustacean

species of crustacean

The Grapsoidea are a superfamily of crabs; they are well known and contain many taxa which are terrestrial (land-living), semiterrestrial (taking to the sea only for reproduction), or limnic (living in fresh water). Another well-known member with a more conventional lifestyle is the Chinese mitten crab, Eriocheir sinensis.

The Sesarmidae are a family of crabs, previously included in the Grapsidae by many authors. Several species, namely in Geosesarma, Metopaulias, and Sesarma, are true terrestrial crabs. They do not need to return to the sea even for breeding.

The Varunidae are a family of thoracotrematan crabs. The delimitation of this family, part of the taxonomically confusing Grapsoidea, is undergoing revision. For a long time, they were placed at the rank of subfamily in the Grapsidae, but they appear to be closest to Macropthalmus and the Mictyridae, which are usually placed in the Ocypodoidea. It may thus be better to merge the latter superfamily with the Grapsoidea, retaining the latter name as it is older.

The Plagusiidae are a family of crabs, formerly treated as a subfamily of the family Grapsidae, but have since been considered sufficiently distinct to be a family in their own right. The family Plagusiidae used to include a subfamily Plagusiinae, comprising the genera Percnon and Plagusia, which constitute a widespread group of litophilic, intertidal and subtidal crabs that are notorious for their speed and their agility.

Gecarcinus is the type genus of the land crab family Gecarcinidae. They are found in warmer coastal regions of the Americas, including islands in the Caribbean. Four species from oceanic islands were formerly included in Gecarcinus as the subgenus Johngarthia, but are now treated as a separate genus, Johngarthia. While all members of this genus are largely terrestrial, they have to return to the ocean to breed (the larvae are released into the sea). They are often colourful, with reddish, orange, purple, yellowish, whitish, or blackish being the dominating hues. This has resulted in some speci

species of crustacean

species of crustaceans

Eriocheir is a genus of crabs, including the Chinese mitten crab, E. sinensis. Formerly in the family Grapsidae, it is now placed in the Varunidae. left|thumb|Comparison between Japanese mitten crab|Japanese (left) and Chinese (right) mitten crabs

species of crustacean

species of crustacean

species of crustacean

crab species

small crab found on rocky and hard-mud shores

species of crustacean

Gecarcoidea is a genus of terrestrial crabs within the family Gecarcinidae.

species of crustacean

Percnon is a genus of crabs in the family Percnidae. It has also been included in the family Plagusiidae as subfamily Percninae.

species of Malacostraca

thumb|Plagusia dentipes painted by [[Kawahara Keiga in the period 1823 - 1829.]]

Hemigrapsus is a genus of varunid crabs comprising thirteen species native almost exclusively in the Pacific Ocean, but two have been introduced to the North Atlantic region.

species of crustacean

species of terrestrial crab

species of crustacean

species of crustacean

species of crustacean

species of crustacean

species of crustacean

Cardisoma is a genus of large land crabs. Three species formerly placed in this genus are now placed in Discoplax. The four species that remain in Cardisoma are found in warm coastal regions where they live in burrows. Young individuals are often very colourful with a purple-blue carapace and orange-red legs (leading to a level of popularity in the pet trade), but as they grow older the colours tend to fade, and females may be duller than males. Although less extreme than in fiddler crabs, one claw is usually considerably larger than the other. They are omnivores, but primarily feed on plant m

species of crustacean

species of crustacean

Johngarthia is a genus of crabs in the land crab family Gecarcinidae, formerly included in the genus Gecarcinus, and containing six species. The genus bears the name of John S. Garth, a 20th century naturalist who specialized in crabs and other arthropods.

species of crustacean

species of crustacean

Discoplax is a genus of terrestrial crabs. It is very closely related to the genera Cardisoma and Tuerkayana.

species of crustacean

species of Malacostraca

Epigrapsus is genus of terrestrial crabs. The two species are omnivores. Epigrapsus notatus (Heller, 1865) Epigrapsus politus Heller, 1862

species of crustacean

Chasmagnathus convexus is a common mud-flat crab of the family Varunidae, which is endemic to East Asia. In Japan, this crab is commonly called hamagani. This crab has two forms that differ in color; one is olive green and the other is purple. Differences in diet are believed to be responsible for the color variation between the two forms. C. convexus is large, relative to related crabs, and can reach wide across its carapace. It is predominantly nocturnal.

species of crustacean

species of crustacean

species of crustacean

species of crustacean

Cyclograpsus is a genus of crabs, containing the following species:

species of crustacean

Percnidae is a family of crabs in the superfamily Grapsoidea. Percnidae contains about six described species in one genus: Percnon (Gistel, 1848).

species of crustacean

species of crustacean

species of crustacean

Helicana is a genus of crabs, containing three species:

species of crustacean

Paragrapsus is a genus of crabs from South Eastern Australia, containing the following species:

species of crustacean

genus of crabs

Brachynotus is a genus of crabs, comprising the following species: Brachynotus atlanticus Forest, 1957 Brachynotus foresti Zariquiey Alvarez, 1968 Brachynotus gemmellari (Rizza, 1839) Brachynotus gemmellaroi (Rizza, 1839) Brachynotus sexdentatus (Risso, 1827) Brachynotus spinosus (H. Milne-Edwards, 1853)

species of crustacean