[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 †Hybodonta [monotypic] - hybodonts
               Order †Hybodontiformes Patterson, 1966
                 01 Family †Hybodontidae Agassiz, 1843
                 02 Family †Thaiodontidae Cuny, Suteethorn, Kamha & Buffetaut, 2008
                 03 Family †Tristychiidae Moy-Thomas, 1939
                 04 Family †Distobatidae Werner, 1989
                 05 Family †Acrodontidae Giebel, 1846
                 06 Family †Polyacrodontidae Glickman, 1964
                 07 Family †Lonchidiidae Herman, 1977
                 08 Family †Steinbachodontidae Reif, 1980
                 09 Family †Pseudodalatiidae Reif, 1978
                 10 Family †Homalodontidae Mutter, Neuman & de Blanger, 2008
                 11 Family †Sphenacanthidae Maisey, 1982, "nom. praeval."