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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]
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.
Potamon is a genus of freshwater or semiterrestrial crabs mainly found from Southern Europe through the Middle East, and as far east as north-western India. [2] The only exception is the North African P. algeriense, which also is the only potamid of mainland Africa. Twenty species are currently recognised.
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.
They only breed in moving water, with copulation occurring in the warmer months, from June to October. [ 1 ] Potamon ibericum is an omnivore, eating detritus , filamentous algae , and plant matter, as well as a variety of animals, including worms , amphipod crustaceans , aquatic insect larvae, molluscs , frogs and tadpoles , fish , and carrion ...
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 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).
Platythelphusa is a genus of freshwater crabs endemic to Lake Tanganyika.It has been placed in a number of families, including a monotypic family, Platythelphusidae, as well as Potamidae and its current position in the Potamonautidae, and has also been treated as a subgenus of Potamonautes.
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