[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 Elasmobranchii Bonaparte, 1838
               Division Batomorphi - rays
                 Order †Sclerorhynchiformes Kriwet, 2004
                   1 Family †Sclerorhynchidae Capetta, 1974, "nom. praeval."
                   2 Family †Ptychotrygonidae Kriwet, Nunn & Klug, 2009