#family_Hexanchidae__Hexanchidae  primitive sharks
  supertype:  fish_family  any of various families of fish
  member of:  subclass_Elasmobranchii
  member:  genus_Hexanchus__Hexanchus  a genus of Hexanchidae
     member:  cow_shark__cowshark__six-gilled_shark__Hexanchus_griseus  large primitive shark widely distributed in warm seas

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