Phylum [Vertebrata] (Lamarck, 1801) Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893 Order Anseriformes Wagler, 1831 - waterfowl and screamers Genus †Presbyornis Wetmore, 1926