#family_Hexanchidae__Hexanchidae  primitive sharks
  supertype:  fish_family  any of various families of fish
  member:  genus_Hexanchus
  member of:  subclass_Elasmobranchii__Elasmobranchii__Selachii__subclass_Selachii  sharks; rays; dogfishes; skates
     member of:  class_Chondrichthyes__Chondrichthyes  cartilaginous fishes
        member of:  subphylum_Vertebrata__Vertebrata__Craniata__subphylum_Craniata  fishes; amphibians; reptiles; birds; mammals
           member of:  phylum_Chordata__Chordata  comprises true vertebrates and animals having a notochord
              member of:  kingdom_Animalia__Animalia__animal_kingdom  taxonomic kingdom comprising all living or extinct animals

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