Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass †Enantiornithes Walker, 1981 see Infraclass Enantiornithes Walker, 1981
     Order †Cathayornithiformes Zhou, Jin & Zhang, 1992
       Family †Cathayornithidae Zhou, Jin & Zhang, 1992
         1 Genus †Eocathayornis Zhou, 2002
         2 Genus †Cathayornis Zhou, Jin & Zhang, 1992
         3 Genus †Sinornis Sereno & Rao, 1992