Opisthobranchia
gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares • Syn: subclass Opisthobranchia • Hypernyms: class • Member Holonyms: Gastropoda, class Gastropoda, Gasteropoda, class Gasteropoda • Member Meronyms: Nudibranchia, order Nudibranchia
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