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any marine gastropod of the family Aplysiidae (subclass Opisthobranchia) that is characterized by a shell reduced to a flat plate, prominent tentacles (resembling rabbit ears), and a smooth or warty body. Sea hares eat large seaweeds. An example is the 10-centimetre (4-inch) spotted sea hare (Aplysia dactylomela), a ring-spotted green species living in grassy shallows of the Caribbean.