Nudibranchia
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Noun | 1. | ![]() animal order - the order of animals Opisthobranchia, subclass Opisthobranchia - gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares nudibranch, sea slug - any of various marine gastropods of the suborder Nudibranchia having a shell-less and often beautifully colored body genus Hermissenda, Hermissenda - genus of marine sea slugs |