Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Subclass †Odontoholcae (Marsh, 1875) Stejneger, 1885 see Cohort Ornithurae Haeckel, 1866 Order †Hesperornithiformes Fürbringer, 1888 Family †Hesperornithidae Marsh, 1872 Genus †Coniornis Marsh, 1893 1 †Coniornis altus Marsh, 1893