Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct.
       Vertebrata Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
         Myopterygii Janvier, 1978 - myopterygians
           Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
             Grade Chondrichthiomorphi see Grade Chondrichthyomorphi
               Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
                 Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes see Infraclass Elasmobranchii Bonaparte, 1838
                   Infraclass Euselachii Hay, 1902 - sharks and rays, and related fossils see Subclass Euselachii Hay, 1902
                     Division Neoselachii Compagno, 1977 see Infraclass Elasmobranchii Bonaparte, 1838
                       Subdivision Batoidea - rays
                         Order Myliobatiformes Compagno, 1973 - stingrays
                           Suborder Platyrhinoidei [monotypic] see Order Torpediniformes de Buen, 1926
                             Family Platyrhinidae Jordan, 1923 - thornbacks
                               1 Genus †Tethybatis de Carvalho, 2004
                               2 Genus Platyrhina Müller & Henle, 1838
                               3 Genus Platyrhinoidis Garman, 1881 [monotypic]