| NOUN | animal | subclass Opisthobranchia, Opisthobranchia | gastropods having the gills when present posterior to the heart and having no operculum |
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| Meaning | gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares. | |
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| Synonym | Opisthobranchia | |
| Member of | Gastropoda, class Gastropoda, Gasteropoda, class Gasteropoda | snails and slugs and their relatives |
| Members | Nudibranchia, order Nudibranchia | Comprising numerous marine gastropod mollusks lacking a shell in the adult state and usually having a body like a slug |
| Broader | class | (biology) a taxonomic group containing one or more orders |
| Spanish | opistobranquios | |
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