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
                 1 Family †Discosauriscidae Romer, 1947 see Subfamily Discosauriscinae Romer, 1947
                 2 Family †Kotlassiidae Romer, 1934
                 3 Family †Seymouriidae Williston, 1911