[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 Myliobatiformes Compagno, 1973 - stingrays
                   Suborder Myliobatoidei Compagno, 1973 see Order Myliobatiformes Compagno, 1973
                     Family Urotrygonidae McEachran, Dunn & Miyake, 1996 - American round stingrays