Definition of Subclass opisthobranchia

1. Noun. Gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares.

Exact synonyms: Opisthobranchia
Group relationships: Class Gasteropoda, Class Gastropoda, Gasteropoda, Gastropoda
Member holonyms: Nudibranchia, Order Nudibranchia
Generic synonyms: Class

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