Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass †Enantiornithes Walker, 1981 see Infraclass Enantiornithes Walker, 1981
     1 Order †Protopterygiformes Zhou & Zhang, 2006
     2 Order †Eoenantiornithiformes Hou et al., 1999
     3 Order †Longipterygithiformes nom. null. see Order Longipterygiformes Zhang, Zhou, Hou & Gu, 2001
     4 Order †Cathayornithiformes Zhou, Jin & Zhang, 1992
     5 Order †Boluochiformes Zhou & Zhang, 2006 see Order Longipterygiformes Zhang, Zhou, Hou & Gu, 2001
     6 Order †Liaoxiornithiformes
     7 Order †Longirostravisiformes Zhou & Zhang, 2006 see Order Longipterygiformes Zhang, Zhou, Hou & Gu, 2001