Classification of Kurochkin 2000
Cl. Aves Linnaeus 1758 [bird]
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Subcl. Ornithurae Haeckel 1866
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Infracl. Neornithes Gadow 1893
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Superor. Palaeognathae Pycraft 1900
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Invalid names: Odontornithes Marsh 1873 [empty]
Subcl. †Sauriurae Haeckel 1866
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Infracl. †Enantiornithes Walker 1981
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Or. †Alexornithiformes Brodkorb 1976
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Fm. †Alexornithidae Brodkorb 1976
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G. †Alexornis Brodkorb 1976
G. †Neuquenornis Chiappe and Calvo 1994
Fm. †Avisauridae Brett-Surman and Paul 1985
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G. †Avisaurus Brett-Surman and Paul 1985
G. †Enantiornis Walker 1981
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†Enantiornis leali Walker 1981
†Enantiornis martini Nessov and Panteleyev 1993
†Enantiornis walkeri Nessov and Panteleyev 1993
G. †Soroavisaurus Chiappe 1993
Invalid names: Kuszholiidae Nessov 1992 [empty]
Unr. Maniraptora Gauthier 1986 [maniraptoran]
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Fm. †Parvicursoridae Karhu and Rautian 1996
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