Phylum Chordata Bateson, 1885 - chordates
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   Subphylum Vertebrata Cuvier, 1812 - vertebrates
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     Superclass Homotherma
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       Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
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         1 Subclass †Sauriurae Haeckel, 1866 see Subclass Archaeornithes Gadow, 1893
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         2 Subclass Ornithurae Haeckel, 1866 see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991}
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