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Noun1.Tethyidae - sea haresTethyidae - sea hares        
mollusk family - a family of mollusks
Nudibranchia, order Nudibranchia - comprising numerous marine gastropod mollusks lacking a shell in the adult state and usually having a body like a slug
Aplysia, genus Aplysia, genus Tethus, Tethys - type genus of the family Aplysiidae
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References in periodicals archive ?
Those of the nudibranchs Melibe leonina, Tritonia diomedea (Tethyidae), Armina californica (Arminidae), Janolus fuscus (Zephyrinidae), and Phyllaplysia taylori (Aplysiidae) were collected in the waters of the San Juan Islands and maintained in flow-through seawater tables at the University of Washington's Friday Harbor Laboratories.
Melibe leonina, a carnivorous nudibranch of the family Tethyidae, is distinguished by an extended oral veil used in prey capture (Agersborg, 1923).