Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
   Amphibia Gray 1825 [Gauthier, Kluge & Rowe 1988] - amphibians see Class Amphibia Gray, 1825
     Gymnophiona Müller, 1832 see Order Gymnophiona Rafinesque, 1814
       Stegokrotaphia Cannatella & Hillis, 1993
         Family Caeciliidae Rafinesque, 1814
           Subfamily Typhlonectinae Taylor, 1968
             1 Genus Atretochoana Nussbaum & Wilkinson, 1995
             2 Genus Chthonerpeton Peters, 1880
             3 Genus Nectocaecilia Taylor, 1968
             4 Genus Potomotyphlus Taylor, 1968 see Genus Potamotyphlus Taylor, 1968
             5 Genus Typhlonectes Peters, 1880