Subclass Avialae Gauthier, 1986 see Clade Avialae Gauthier 1986 Infraclass Aves Linnaeus, 1758 see Subclass Aves Linnaeus, 1758 Parvclass †Ornithurae Haeckel, 1866 see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991} Superorder †Odontoholomorphae Stejneger, 1885 see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991} Order †Hesperornithiformes Fürbringer, 1888 Family †Hesperornithidae Marsh, 1872