Phylum Chordata Bateson, 1885 - chordates Count: - Subphylum Vertebrata Cuvier, 1812 - vertebrates Count: - Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Count: - Order †Enantiornithiformes Martin, 1983 see Order Alexornithiformes Brodkorb, 1976 Count: -