Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass †Enantiornithes Walker, 1981 see Infraclass Enantiornithes Walker, 1981
     Order †Liaoxiornithiformes
       Family †Liaoxiornithidae
         1 Genus †Liaoxiornis Hou & Chen, 1999, nom. dub.