Phylum [Vertebrata] (Lamarck, 1801)
   Class Amphibia Linnaeus, 1758 - amphibians see Class Amphibia Gray, 1825
     Subclass †Lepospondyli Zittel, 1888 see Superorder Lepospondyli Zittel, 1887
       Order †Aistopoda (Miall, 1875) see Order Aïstopoda
         1 Family †Ophiderpetontidae Schwarz, 1908
         2 Family †Phlegethontiidae Cope, 1875