Classification of Norell and Clarke 2001
Unr. Avialae Gauthier 1986 [avialan]
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G. †Archaeopteryx Meyer 1861
G. †Confuciusornis Hou et al. 1995
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
Unr. Ornithurae Haeckel 1866
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Unr. Aves Linnaeus 1758 [bird]
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G. Anas Linnaeus 1758
G. Chauna Illiger 1811 [crested screamer]
G. Crypturellus Brabourne and Chubb 1914
G. Gallus Brisson 1766 [junglefowl]
G. †Baptornis Marsh 1877
G. †Hesperornis Marsh 1872
G. †Ichthyornis Marsh 1872
G. †Patagopteryx Alvarenga and Bonaparte 1992