Phylum [Vertebrata] (Lamarck, 1801) Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893 Order Gruiformes Bonaparte, 1854 Genus †Diatryma Cope, 1876 Genus †Neocathartes Wetmore, 1950 Genus †Phorusrhacus