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More than 1,300 described species of freshwater crabs are known, out of a total of 6,700 species of crabs across all environments. [1] The total number of species of freshwater crabs, including undescribed species, is thought to be up to 65% higher, potentially up to 2,155 species, although most of the additional species are currently unknown to science. [1]
The blue crab, Callinectes sapidus was chosen as the state crustacean of Maryland in 1989. [17] C. sapidus is a crab found in the waters of the western Atlantic Ocean, the Pacific coast of Central America and the Gulf of Mexico. The blue crab may grow to a carapace width of 230 mm (9.1 in).
The genus is the only evolutionary radiation of crabs to have occurred in a freshwater lake, and it occurred recently, probably since the Pliocene. [2] This parallels the better known radiation of cichlid fishes in Lake Tanganyika. [3] Only one other species of freshwater crab is found in Lake Tanganyika, Potamonautes platynotus. [2]
Mangrove crabs are predated on by wading birds, fish, sharks, [8] monkeys, hawks, and raccoons. [7] The larvae of mangrove crabs is a major source of food for juvenile fish in waterways near the crabs. [24] Adult mangrove crabs are food for the crab plover among other protected species. [17] To protect themselves the crabs can climb trees. [25]
Crabs are members of infraorder Brachyura. They are crustaceans with five pairs of legs, the first pair modified to form a pair of pincers, a flattish shell, and a short, broad abdomen folded under its thorax.
Small, colorful, and a lover of habitats with sandy substrates, Red-clawed Crabs are some of the best aquarium pets that aren’t fish. Also known as Mangrove Crabs or Red Crabs, these clawed ...
Some species of terrestrial crabs can be found many kilometres from the sea, but have to complete annual migrations to the sea. [3] For example, following the Indian Ocean monsoon , the Christmas Island red crab ( Gecarcoidea natalis ) migrates en masse , forming a "living carpet" of crabs.
Consequently, they can be threatening, especially to crabs, shrimps, and smaller fish, and are known for hopping out of tanks, so make sure yours is covered. Scientific name oxycirrhites typus ...