#subclass_Opisthobranchia__Opisthobranchia  gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
  supertype:  class__clas  (biology) a taxonomic group containing one or more orders
  member:  order_Nudibranchia
  member of:  class_Gastropoda__Gastropoda__Gasteropoda__class_Gasteropoda  snails and slugs and their relatives
     member of:  phylum_Mollusca__Mollusca  gastropods; bivalves; cephalopods; chitons
        member of:  kingdom_Animalia__Animalia__animal_kingdom  taxonomic kingdom comprising all living or extinct animals

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