Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801 Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Subclass †Odontornithes (Marsh, 1873) 1 Order †Ichthyornithiformes Marsh, 1873 2 Order †Hesperornithiformes Fürbringer, 1888