Subphylum [Vertebrata] Cuvier, 1812 - vertebrates
   Class Agnatha Cope, 1889
     Subclass †Thelodonti Kiaer, 1932
       Order †Furcacaudiformes Wilson & Caldwell, 1998 - forktail thelodonts
         Family †Furcacaudidae Wilson & Caldwell, 1998
           1 Genus †Furcacauda Wilson & Caldwell, 1998
           2 Genus †Cometicercus Wilson & Caldwell, 1998
           3 Genus †Drepanolepis Wilson & Caldwell, 1998
           4 Genus †Canonia Vieth, 1980