Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
       Vertebrata (Lamarck, 1801) - vertebrates see Subphylum Vertebrata Cuvier, 1812
         Myopterygii - myopterygians
           Superclass †Thelodonti Jaekel, 1911 [monotypic] - thelodonts
             Class †Thelodonti Jaekel, 1911
               Order †Furcacaudiformes Wilson & Caldwell, 1998 - forktail thelodonts
                 ?Family †Barlowodidae Märss, Wilson & Thorsteinsson, 2002
                   Genus †Sophialepis Märss, Wilson & Thorsteinsson, 2002