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
           1 Genus †Noguerornis Lacasa-Ruiz, 1989 [monotypic]
           2 Genus †Iberomesornis Sanz & Bonaparte, 1992 [monotypic]
           3 Genus †Concornis Sanz & Buscalioni, 1992 [monotypic]
           4 Genus †Sinornis Sereno & Rao, 1992
           5 Genus †Cathayornis Zhou, Jin & Zhang, 1992 [monotypic]
           6 Genus †Boluochia Zhou, 1995 [monotypic]