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
         1 Family †Alexornithidae Brodkorb, 1976
         2 Family †Enantiornithidae Nessov & Borkin, 1983
         3 Genus †Yungavolucris Chiappe, 1993
         4 Genus †Lectavis Chiappe, 1993