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 †Enantiornithidae Nessov & Borkin, 1983
           1 Genus †Enantiornis C.A. Walker, 1981
           2 Genus †Soroavisaurus Chiappe, 1993
           3 Genus †Avisaurus Brett-Surman & Paul, 1985