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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]
Crabs are decapod crustaceans of the infraorder Brachyura (meaning "short tail" in Greek), which typically have a very short projecting tail-like abdomen, usually hidden entirely under the thorax. [ a ] They live in all the world's oceans, in freshwater , and on land .
Potamon fluviatile is a freshwater crab found in or near wooded streams, rivers and lakes in Southern Europe. It is an omnivore with broad ecological tolerances, and adults typically reach 50 mm (2 in) in size during their 10–12 year lifespan. They inhabit burrows and are aggressive, apparently outcompeting native crayfish.
The fiddler crabs sold in pet stores generally come from brackish water lagoons. Because they live in lower salinity water, pet stores may call them fresh-water crabs, but they cannot survive indefinitely in fresh water. [37] Fiddler crabs have been known to attack small fish in captivity, as opposed to their natural feeding habits. [38]
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]
Despite the possibly misleading common name, European green crabs are not only green. The underside of their carapace can range from green to yellow to orange to red. The best way to identify them is through other characteristics, such as the five spines on either side of their eyes, with three in between them. Carcinus maenas is a common ...
In the video, filmed by park rangers, the four-inch-long freshwater crab emerges from its burrow near a resting pride of lions. One lion notices the crab. The crab immediately gets in a defensive ...
Austrothelphusa transversa (von Martens, 1868), also known as the inland crab, freshwater crab, or tropical freshwater crab [3] is a species of freshwater crab endemic to Australia. [1] A. transversa is the most widely-dispersed species of its genus, as it has adaptations giving it a high tolerance to drought and arid conditions.