opisthobranchia

Noun
  1. Gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs;
    Sea butterflies;
    Sea hares (synset 101952836)
    is a type of: class - (biology) a taxonomic group containing one or more orders
    member holonym: nudibranchia, order nudibranchia - comprising numerous marine gastropod mollusks lacking a shell in the adult state and usually having a body like a slug
    belongs to: class gasteropoda, class gastropoda, gasteropoda, gastropoda - snails and slugs and their relatives
    same as: subclass opisthobranchia

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