Chordata Bateson, 1885 - chordates Count: - Vertebrata Cuvier, 1812 - vertebrates Count: - Homotherma Count: - Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Count: - Ornithurae Haeckel, 1866 see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991} Count: - 1 Ratitae (Merrem, 1813) Count: - 2 Carinatae Merrem, 1813 Count: -