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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]
Blue crab escaping from the net along the Core Banks of North Carolina.. Callinectes sapidus (from the Ancient Greek κάλλος,"beautiful" + nectes, "swimmer", and Latin sapidus, "savory"), the blue crab, Atlantic blue crab, or, regionally, the Maryland blue crab, is a species of crab native to the waters of the western Atlantic Ocean and the Gulf of Mexico, and introduced internationally.
Crabs are prepared and eaten as a dish in many different ways all over the world. Some species can be eaten whole, including the shell, as soft-shell crabs; with other species, just the claws or legs are eaten. The latter is particularly common for larger crabs, such as the snow crab.
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.
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]
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 littoral crab. It is known by different names around the world. In the British Isles, it is generally referred to as the shore crab, or green shore crab.
The crabs are collected by certain crab catching communities or experts belonging to certain castes and tribes. Then they are sold in the weekly markets. They are not exhibited in special crab markets but rather in fish markets. The species is hardy to withstand without water in moist and can airbreath and remain live without food for a few days.
Portunidae is a family of crabs which contains the swimming crabs. Its members include many well-known shoreline crabs, such as the blue crab ( Callinectes sapidus ) and velvet crab ( Necora puber ). Two genera in the family are contrastingly named Scylla and Charybdis ; the former contains the economically important species black crab ( Scylla ...