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opisthobranchia
 
Noun opisthobranchia has 1 sense
  1. Opisthobranchia, subclass Opisthobranchia - gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
    --1 is a kind of class
    --1 is a member of Gastropoda, class Gastropoda, Gasteropoda, class Gasteropoda
    --1 has members: Nudibranchia, order Nudibranchia
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