Classification of Brodkorb 1971
G. †Hesperornis Marsh 1872
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†Hesperornis gracilis Marsh 1876
†Hesperornis regalis Marsh 1872
G. †Ornithosuchus Newton 1894
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†Ornithosuchus taylori Broom 1913
†Ornithosuchus woodwardi Newton 1894
G. †Archaeopteryx Meyer 1861
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†Archaeopteryx lithographica Meyer 1861
†Archaeopteryx siemensii Dames 1897
Fm. †Enaliornithidae
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Or. Podicipediformes Fürbringer 1888 [grebe]
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Fm. †Baptornithidae American Ornithologists' Union 1910
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Fm. †Apatornithidae Fürbringer 1888
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Fm. †Hesperornithidae Marsh 1872
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