Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass †Sauriurae Haeckel, 1866 see Subclass Archaeornithes Gadow, 1893
     Infraclass †Enantiornithes Walker, 1981
       Order †Alexornithiformes Brodkorb, 1976
         Family †Alexornithidae Brodkorb, 1976
           Genus †Nanantius Molnar, 1986
             †Nanantius valifanovi Kurochkin, 1996 see Gobipteryx minuta Elżanowski, 1974