[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
                 1 Order Hexanchiformes Compagno, 1973 - six-gill sharks
                 2 Order Squaliformes Compagno, 1973 - dogfish sharks
                 3 Order †Protospinaciformes [monotypic]
                 4 Order Echinorhiniformes - bramble sharks
                 5 Order Squatiniformes Buen, 1926 - angel sharks
                 6 Order Pristiophoriformes Compagno, 1973 [monotypic] - saw sharks