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pea crab

noun
1.
any of several tiny crabs of the family Pinnotheridae, the female of which lives as a commensal in the shells of bivalve mollusks.
Origin
1830-1840
1830-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pea crab

pea crab

noun
1.
any of various globular soft-bodied crabs of the genus Pinnotheres and related genera that live commensally in the mantles of certain bivalves
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for pea crab

any member of a genus (Pinnotheres) of crabs (order Decapoda) living in certain bivalve mollusks as a commensal (i.e., on or in another animal host but not deriving nourishment from it). Females of Pinnotheres ostreum, also known as the oyster crab, are found in oysters of the Atlantic coastal waters of North America and are especially abundant in oysters of Chesapeake Bay. The body of the female is pinkish white and up to 2 cm (about 0.75 inch) across. An irregular stripe runs from front to back across the carapace, or back. Males, seldom seen, are smaller, dark brown, and usually free-swimming. The female pea crab holds her eggs with the back legs until they hatch. The larvae leave their mollusk home and swim before settling in another mollusk shell

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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