swimming crab

swimming crab
any of numerous, chiefly marine crabs, esp. of the family Portunidae, having the legs adapted for swimming.

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 any member of the family Portunidae (order Decapoda of the class Crustacea, phylum Arthropoda). In these animals, the fifth (hindmost) pair of legs are flattened into paddles for swimming. The family includes the blue crab (Callinectes sapidus), an edible crab of the Atlantic coast of North America; the velvet crab, Portunus, of the Atlantic and Pacific oceans and the Mediterranean Sea (see photograph—>); and Neptunus of the Indian and Pacific oceans.

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Universalium. 2010.

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