Though shaped very much like lice, the Histriobdellidae are actually tiny annelids (like leeches or earthworms) who live a louse-like existence on the outer shells of crayfish, isopods and other crustaceans. While our lice have specially hooked claws for gripping hair, these louse worms have suckers for clinging to a smooth exoskeleton, and a powerful set of drilling jaws for getting at that tasty sea-bug blood.
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