Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Subclass †Enantiornithes Walker, 1981 see Infraclass Enantiornithes Walker, 1981 Order †Eoenantiornithiformes Hou et al., 1999 1 Family †Eoenantiornithidae Hou et al., 1999