Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
       Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes
         1 Order †Cladoselachida Dean, 1909 [monotypic] see Order Cladoselachiformes
         2 Order †Coronodontia
         3 Order †Symmoriida Zangerl, 1981
         4 Order †Eugeneodontida see Order Eugeneodontiformes Zangerl, 1981
         5 Order †Orodontida Zangerl, 1981 [monotypic] see Order Orodontiformes Zangerl, 1981
         6 Order †Squatinactida see Order Squatinactiformes Zangerl, 1981
         7 Superorder Euselachii Hay, 1902 see Infraclass Euselachii Hay, 1902