Classification of Chiappe and Calvo 1994

G. †Archaeopteryx Meyer 1861
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Unr. Ornithurae Haeckel 1866
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Or. †Hesperornithiformes Fürbringer 1888
G. †Ichthyornis Marsh 1872
Subcl. Neornithes Gadow 1893
Unr. Ornithothoraces Chiappe and Calvo 1994
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Subcl. †Enantiornithes Walker 1981
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G. †Alexornis Brodkorb 1976
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†Alexornis antecedens Brodkorb 1976
Fm. †Avisauridae Brett-Surman and Paul 1985
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G. †Avisaurus Brett-Surman and Paul 1985
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†Avisaurus archibaldi Brett-Surman and Paul 1985
G. †Neuquenornis Chiappe and Calvo 1994
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†Neuquenornis volans Chiappe and Calvo 1994
G. †Soroavisaurus Chiappe 1993
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†Soroavisaurus australis Chiappe 1993
G. †Cathayornis Zhou et al. 1992
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†Cathayornis yandica Zhou et al. 1992
G. †Enantiornis Walker 1981
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†Enantiornis leali Walker 1981
G. †Lectavis Chiappe 1993
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†Lectavis bretincola Chiappe 1993
G. †Yungavolucris Chiappe 1993
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G. †Iberomesornis Sanz et al. 1990
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†Iberomesornis romerali Sanz et al. 1990
Subcl. Ornithurae Haeckel 1866
G. †Patagopteryx Alvarenga and Bonaparte 1992
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†Patagopteryx deferrariisi Alvarenga and Bonaparte 1992
G. †Alvarezsaurus Bonaparte 1991
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†Alvarezsaurus calvoi Bonaparte 1991
G. †Velocisaurus Bonaparte 1991
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†Velocisaurus unicus Bonaparte 1991