Pin·no·the·res | \ ˌpinəˈthi(ˌ)rēz \
Definition of Pinnotheres
: a genus (the type of the family Pinnotheridae) of small crabs (as the oyster crab and the pea crab) having usually a thin membranous covering and living as commensals in the mantle cavity of various bivalve mollusks or in some similar cavity in other marine animals
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