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The oldest is Tanzanonautes tuerkayi, from the Oligocene of East Africa, and the evolution of freshwater crabs is likely to postdate the break-up of the supercontinent Gondwana. [ 2 ] Members of the family Aeglidae and Clibanarius fonticola are also restricted to fresh water, but these "crab-like" crustaceans are members of the infraorder ...
The carapace width of mature Dungeness crabs may reach 25 cm (9.8 in) in some areas off the coast of Washington, but are typically under 20 cm (7.9 in). [22] They are a popular delicacy, and are the most commercially important crab in the Pacific Northwest, as well as the western states generally. [23]
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.
The brown box crab (Echidnocerus foraminatus) is a king crab that lives from Prince William Sound, Alaska to San Diego, California, [2] at depths of 0–547 metres (0–1,795 ft). [3] It reaches a carapace length of 150 millimetres (5.9 in) and feeds on bivalves and detritus .
Parathelphusa pantherina, commonly known as the "panther crab", is a variety of freshwater crab from Indonesia from the family of the Gecarcinucidae . The scientific name of the species was published for the first time in 1902 by Schenkel.
The sand crabs with soft shells that have just moulted are kept for bait, while the hard-shelled crabs are thrown back into the sea. [ 6 ] The sand crab has been evaluated as an indicator species for monitoring the level of domoic acid -synthesizing diatoms ( Pseudo-nitzschia spp.) which sometimes cause toxic blooms off the coast of California.