Classification of Kurochkin et al. 2013
Unr. Ornithurae Haeckel 1866
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Cl. Aves Linnaeus 1758 [bird]
G. †Baptornis Marsh 1877
G. Crypturellus Brabourne and Chubb 1914
G. †Hesperornis Marsh 1872
G. †Ichthyornis Marsh 1872
G. †Lithornis Owen 1840
Unr. Avialae Gauthier 1986 [avialan]
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G. †Jeholornis Zhou and Zhang 2002
Unr. Pygostylia Chiappe 2002
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Subcl. †Enantiornithes Walker 1981
Unr. †Ornithuromorpha Chiappe 1999
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G. †Apsaravis Norell and Clarke 2001
G. †Archaeorhynchus Zhou and Zhang 2006
G. †Hongshanornis Zhou and Zhang 2005
G. †Liaoningornis Hou 1997
Subcl. Ornithurae Haeckel 1866
G. †Patagopteryx Alvarenga and Bonaparte 1992
G. †Yanornis Zhou and Zhang 2001
G. †Yixianornis Zhou and Zhang 2001
G. †Sapeornis Zhou and Zhang 2002
Unr. †Enantiornithes Walker 1981
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G. †Cathayornis Zhou et al. 1992
G. †Concornis Sanz and Buscalioni 1992
G. †Confuciusornis Hou et al. 1995
G. †Gobipteryx Elzanowski 1974
G. †Neuquenornis Chiappe and Calvo 1994