Classification of Clarke et al. 2005

Unr. Ornithurae Haeckel 1866
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G. †Apsaravis Norell and Clarke 2001
Infracl. Aves Linnaeus 1758 [bird]
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Unr. Neognathae Pycraft 1900
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Unr. Galloanserae Sibley and Ahlquist 1990
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Or. Anseriformes Wagler 1831 [waterfowl]
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Invalid names: Anatoidea Leach 1820 [empty]
Or. Galliformes Temminck 1820 [fowl]
Unr. Neoaves Sibley 1988
Superor. Palaeognathae Pycraft 1900
Or. †Hesperornithiformes Fürbringer 1888
Or. †Ichthyornithiformes Marsh 1873
Unr. Avialae Gauthier 1986 [avialan]
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Subcl. †Enantiornithes Walker 1981
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G. †Cathayornis Zhou et al. 1992
G. †Concornis Sanz and Buscalioni 1992
G. †Gobipteryx Elzanowski 1974
G. †Neuquenornis Chiappe and Calvo 1994
Subcl. Ornithurae Haeckel 1866
G. †Patagopteryx Alvarenga and Bonaparte 1992
G. †Vorona Forster et al. 1996