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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]
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 crabs prefer a humid environment with elements from both terrestrial and freshwater aquatic habitats. They steer clear of drier land and although the younger crabs tend to live in closer proximity to the water, they are not aquatic crabs. Young Red Devil crabs spend most of their time in the water as a way to avoid predators.
The crab seen fending off the lions is a freshwater crab of the genus Potamonautes. There have been 26 species discovered in South Africa as of 2023, with new species discovered in recent years.
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.
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".
Potamonautes lirrangensis, the Malawi blue crab, [2] is a species of freshwater crab in the family Potamonautidae. This common and widespread species is found in Lake Malawi , Lake Kivu , the upper Congo River Basin and Malagarasi River in the Democratic Republic of the Congo , Malawi , Rwanda , and Tanzania . [ 1 ]
Leptuca speciosa, commonly known as the brilliant fiddler crab or the longfinger fiddler crab, is a species of fiddler crab native to the southern United States, Mexico, and the Caribbean. [1] Before 2016, the species was known as Uca speciosa. In 2016, the subgenus Leptuca was promoted to the genus level. [2] [3]