Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct.
       Vertebrata Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
         Myopterygii Janvier, 1978 - myopterygians
           Superclass †Thelodonti Jaekel, 1911 [monotypic] - thelodonts see Superclass Thelodontomorphi Jaekel, 1911
             Class †Thelodonti Jaekel, 1911
               Order †Thelodontiformes Kiaer, 1932
                 Family †Nikoliviidae Karatajūtė-Talimaa, 1978
                   1 Genus †Chattertonodus Märss, Wilson & Thorsteinsson, 2002
                   2 Genus †Nikolivia Karatajūtė-Talimaa, 1978