Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Amphibia Linnaeus, 1758 - amphibians see Class Amphibia Gray, 1825
               Subclass †Labyrinthodontia Meyer, 1842 see Class Amphibia Linnaeus, 1758
                 Order †Ichthyostegalia (Save-Soderbergh, 1932) see Superclass Tetrapoda Goodrich, 1930
                   1 Family †Ichthyostegidae Save-Soderbergh, 1932
                   2 Family †Elpistostegidae Romer, 1947 - elpistostegids
                   3 Family †Acanthostegidae Jarvik, 1952