oyster crab

oyster crab

noun
a pea crab, Pinnotheres ostreum, the female of which lives as a commensal within the mantle cavity of oysters.

Origin:
1750–60

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World English Dictionary
oyster crab
 
n
any of several small soft-bodied crabs of the genus Pinnotheres, esp P. ostreum, that live as commensals in the mantles of oysters

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