Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Subclass †Enantiornithes Walker, 1981 see Infraclass Enantiornithes Walker, 1981 Order †Protopterygiformes Zhou & Zhang, 2006 Family †Protopterygidae Zhou & Zhang, 2006 Genus †Protopteryx Zhang & Zhou, 2000 1 †Protopteryx fengningensis Zhang & Zhou, 2000