[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
         Branch Craniata Linnaeus, 1758
           Grade Gnathostoma
             Subgrade Pentadactyla branchiata
               Class Amphibia Gray, 1825
                 Subclass Phractamphibia Haeckel, 1866
                   Order Gymnophiona Rafinesque, 1814 - caecilians
                     Genus Siphonops Wagler, 1828