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Sea hares are small marine gastropod molluscs of the suborder Anaspidea (P. Fisher, 1883) in the subclass Orthogastropoda, class Gastropoda, phylum Mollusca. Their common name derives from the projections on their bodies which somewhat resemble rabbit ears. Their scientific name (Anaspidea) is derived from the Greek for "without a shield" and refers to the lack of the head shield which characterises other members of the Opisthobranchia.