CRAB is a member of the crustacean branch of the phylum Arthropoda. It is a shelled invertebrate with a segmented body and an exoskeleton. "True" crabs (Brachyurans), including spider crabs and the well-known Dungeness and red rock crab, have 10 jointed appendages, the front two ending in pincers used for feeding. Crabs crawl along the sea bottom eating algae and small marine animals. To grow, a crab must periodically shed its exoskeleton, expand, then form a new, larger one. When the time...

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