Classification of Elzanowski et al. 2001

Superor. †Odontognathae Wetmore 1930
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Or. †Hesperornithiformes Fürbringer 1888
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Fm. †Hesperornithidae Marsh 1872
G. †Potamornis Elzanowski et al. 2001
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†Potamornis skutchi Elzanowski et al. 2001
Or. †Ichthyornithiformes Marsh 1873
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Fm. †Ichthyornithidae Marsh 1873