Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Gnathostomata
     Teleostomi Bonaparte, 1836
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. see Clade Tetrapoda Hatschek & Cori 1896 [Laurin 2020]
         Class Amphibia Gray, 1825 [paraphyletic]
           Subclass †Lepospondyli Zittel, 1888 see Superorder Lepospondyli Zittel, 1887
             Order †Aïstopoda
               1 Family †Ophiderpetontidae Schwarz, 1908
               2 Family †Lethiscidae Wellstead, 1982
               3 Family †Phlegethontiidae Cope, 1875