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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]
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. [4]
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]
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.
A young Levantine freshwater crab in captivity at the NHMC in Greece. Levantine freshwater crabs have an average leg span of 10 to 15 centimeters (4 to 6 inches) and the males are typically larger than the females. Their carapace is slightly arched, smooth, and concave; and has a size 5 to 7 cm (2 to 3 in).
The mangrove tree crab is a small species with males averaging about 2 cm (0.8 in) long and females slightly less. The large eyes are set far apart and the carapace is wider at the front than at the back. It is a mottled brown and olive colour which helps the crab to blend in with its surroundings.
Amarinus lacustris (as Hymenosoma lacustris) in Chilton's 1914 description of a specimen from Norfolk Island. Amarinus lacustris grows to a maximum size of 10 millimetres (0.39 in) across the carapace, with a leg span of 20 mm. [5] [6] The carapace is grey-brown and almost circular, marked with a set of grooves forming an H-shape with the two uprights bending outwards, and the whole animal is ...
Potamonautes sidneyi is a species of freshwater crab in the family Potamonautidae. The common name is the Natal river crab or Sidney's river crab , [ 1 ] although they may also be referred to as "river crabs", "fresh water crabs" or "land crabs".