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Or sp. littoralis? Found in mud while digging clams, but not within a clam.
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There is (or was, not sure if it's still there) a more or less identical specimen held by Cabrillo Aquarium. These crabs are commensals of bivalves; rare to see one washed up on the beach.
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Or sp. littoralis? Found in mud while digging clams, but not within a clam.