Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
   Amphibia Gray 1825 [Gauthier, Kluge & Rowe 1988] - amphibians see Class Amphibia Gray, 1825
     Batrachia Latreille, 1800
       Caudata Fischer von Waldheim, 1813 see Order Caudata Scopoli, 1777
         Diadectosalamandroidei D.R. Frost et al., 2006
           Plethosalamandroidei D.R. Frost et al., 2006
             Xenosalamandroidei Frost et al., 2006
               Family Plethodontidae Gray, 1850
                 1 Subfamily Plethodontinae Gray, 1850
                 2.1 Subfamily Hemidactyliinae Hallowell, 1856
                 2.2 Subfamily Spelerpinae Cope, 1859
                 2.3 Subfamily Bolitoglossinae Hallowell, 1856