#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 of:  class_Gastropoda
  member:  order_Nudibranchia__Nudibranchia  comprising numerous marine gastropod mollusks lacking a shell in the adult state and usually having a body like a slug
     member:  sea_slug__seaslug  any of various marine gastropods of the suborder Nudibranchia having a shell-less and often beautifully colored body
     member:  family_Aplysiidae__Aplysiidae__Tethyidae__family_Tethyidae  sea hares
        member:  genus_Aplysia__Aplysia__Tethys__genus_Tethus  type genus of the family Aplysiidae
           member:  sea_hare__seahare__Aplysia_punctata  naked marine gastropod having a soft body with reduced internal shell and two pairs of ear-like tentacles
     member:  genus_Hermissenda__Hermissenda  genus of marine sea slugs
        member:  Hermissenda_crassicornis  a kind of sea slug

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