Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Class Amphibia Gray, 1825 [paraphyletic]
           Subclass †Labyrinthodontia Meyer, 1842 see Class Amphibia Linnaeus, 1758
             Order †Anthracosauria Säve-Söderbergh, 1934
               Suborder †Seymouriamorpha Watson, 1917 see Order Seymouriamorpha Watson, 1917
                 Family †Seymouriidae Williston, 1911
                   1 Genus †Gnorhinosuchus Efremov, 1951
                   2 Genus †Nyctiboetus Chudinov, 1955
                   3 Genus †Rhinosauriscus Kuhn, 1963
                   4 Genus †Seymouria Broili, 1904