Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Class Amphibia Gray, 1825 [paraphyletic]
           modern amphibian orders
             Order Urodela Dumeril, 1806 see Order Caudata Scopoli, 1777
               Suborder Cryptobranchoidea Dunn, 1922 see [unranked] Cryptobranchoidei Noble, 1931
                 1 Family Hynobiidae Cope, 1859 (1856)
                 2 Family Cryptobranchidae Fitzinger, 1826