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
           Order Galeomorpha see Superorder Galeomorphii Compagno, 1973
             1 Family †Palaeospinacidae Regan, 1906
             2 Suborder Heterodontoidea (Hay, 1902) [monotypic] see Order Heterodontiformes Compagno, 1973
             3 Suborder Orectoloboidea Maylor, 2012 see Order Orectolobiformes Compagno, 1973
             4 Suborder Lamnoidea see Order Lamniformes Berg, 1958
             5 Suborder Carcharhinoidea see Order Carcharhiniformes Compagno, 1973
             6 Suborder Hexanchoidea see Order Hexanchiformes Compagno, 1973