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
       1 Family †Cathayornithidae Zhou, Jin & Zhang, 1992