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The pea crab, Pinnotheres pisum, is a small crab in the family Pinnotheridae that lives symbiotically in oysters, clams, mussels and other species of bivalves.
The Pea crab lives within the bivalve shell. The crab benefits from the protection of the shell, while the bivalve bnefits from the crab keeping the inside of the shell clean.
There are over 6500 species of crab, of which over 500 are Hermit crabs.