Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Gnathostomata
     Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
       Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes see Infraclass Elasmobranchii Bonaparte, 1838
         Superorder Euselachii Hay, 1902 see Subclass Euselachii Hay, 1902
           Order Squalomorpha see Superorder Squalomorphii (Compagno, 1973)
             1 Suborder Squaloidea see Order Squaliformes Compagno, 1973
             2 Suborder Pristiophoroidea [monotypic] see Order Pristiophoriformes Compagno, 1973
             3 Suborder Squatinoidea [monotypic] see Order Squatiniformes Buen, 1926