Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   1 Subclass †Sauriurae Haeckel, 1866 see Subclass Archaeornithes Gadow, 1893
   2 Subclass †Odontoholcae (Marsh, 1875) Stejneger, 1885 see Cohort Ornithurae Haeckel, 1866
   3 Subclass Ornithurae Haeckel, 1866 see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991}