Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
Ref: E.N. Kurochkin, 1996: 22; Count: -
   Subclass †Sauriurae Haeckel, 1866 see Subclass Archaeornithes Gadow, 1893
  Ref: E.N. Kurochkin, 1996: 22, 36; Count: -
     Infraclass †Enantiornithes Walker, 1981
    Ref: E.N. Kurochkin, 1996: 22, 49; Count: [†g] †2o;3f;19g;7s [21 Mar 2017]
       Order †Alexornithiformes Brodkorb, 1976
      Ref: E.N. Kurochkin, 1996: 22, 49; Count: [†g] †2f;13g;2s [21 Mar 2017]
         Family †Alexornithidae Brodkorb, 1976
        Ref: E.N. Kurochkin, 1996: 3, 49; Count: [†g] †8g;2s [21 Mar 2017]
           Genus †Nanantius Molnar, 1986
          Ref: E.N. Kurochkin, 1996: 3, 49; Count: [†*] †2s [21 Mar 2017]
             †Nanantius valifanovi Kurochkin, 1996 see Gobipteryx minuta Elżanowski, 1974
            Ref: E.N. Kurochkin, 1996: 3, 49 [new taxon]; Count: -