Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
       Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes
         Superorder Euselachii Hay, 1902 see Infraclass Euselachii Hay, 1902
           1 Order †Ctenacanthiformes Glikman, 1964
           2 Order †Xenacanthida Glikman, 1964 see Order Xenacanthiformes Berg, 1955
           3 Order Galeomorpha see Superorder Galeomorphii Compagno, 1973
           4 Order Squalomorpha see Superorder Squalomorphii (Compagno, 1973)
           5 Order Batoidea see Superorder Batoidea