Classification of Clarke 2004

Ornithurae Haeckel 1866
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G. †Apatornis Marsh 1873
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Apatornis celer Marsh 1873
G. †Guildavis Clarke 2004
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Guildavis tener Marsh 1880
G. †Iaceornis Clarke 2004
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Iaceornis marshi Clarke 2004
Or. †Ichthyornithes Marsh 1873
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G. †Ichthyornis Marsh 1872
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Ichthyornis dispar Marsh 1872
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Invalid names: Ichthyornis agilis Marsh 1873 [synonym], Ichthyornis anceps Marsh 1872 [synonym], Ichthyornis antecessor Wetmore 1962 [synonym], Ichthyornis validus Marsh 1880 [synonym], Ichthyornis victor Marsh 1876 [synonym]
Avialae Gauthier 1986 [avialan]
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Subcl. Ornithurae Haeckel 1866
Aves Linnaeus 1758 [bird]
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Pangalliformes Clarke 2004
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G. †Austinornis Clarke 2004
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Austinornis lentus Marsh 1877