[Phylum] Chordata Bateson, 1885 - chordates
Subphylum Craniata auct.
Infraphylum Vertebrata Lamarck, 1801 - vertebrates
Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
Subclass Euselachii Hay, 1902 - sharks, rays, and related fossils
Infraclass Elasmobranchii Bonaparte, 1838
Superorder Squalomorphi
Order Hexanchiformes Compagno, 1973 - six-gill sharks
Family Heptranchidae Barnard, 1925