subclass opisthobranchia
English Thesaurus
1. gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares (noun.animal)
| hypernym | : | class, |
| definition | : | (biology) a taxonomic group containing one or more orders (noun.group) |
| member holonym | : | nudibranchia, order nudibranchia, |
| definition | : | comprising numerous marine gastropod mollusks lacking a shell in the adult state and usually having a body like a slug (noun.animal) |
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