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