Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         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