Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass †Sauriurae Haeckel, 1866 see Subclass Archaeornithes Gadow, 1893
     Infraclass †Enantiornithes Walker, 1981
       Order †Euornithiformes Kurochkin, 1996 [monotypic]
         Family †Concornithidae Kurochkin, 1996
           Genus †Cathayornis Zhou, Jin & Zhang, 1992 [monotypic]
             1 †Cathayornis yandica Zhou, Jin & Zhang, 1992