[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata (Lamarck, 1801)
         Branch Craniata Linnaeus, 1758
           Grade Gnathostoma
             Subgrade Pentadactyla branchiata
               Class Amphibia Gray, 1825
                 Subclass Phractamphibia Haeckel, 1866
                   1 Order Labyrinthodonta
                   2 Order Gymnophiona Rafinesque, 1814 - caecilians