Gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares. Synonym: Opisthobranchia.
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Words linked to "Subclass Opisthobranchia" : Gasteropoda, class, Opisthobranchia, order Nudibranchia, class Gasteropoda, class Gastropoda, Gastropoda, Nudibranchia |
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