Classification of Marsh 1873

Subcl. †Odontornithes Marsh 1873
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Or. †Ichthyornithes Marsh 1873
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Fm. †Ichthyornidae Marsh 1873
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G. †Apatornis Marsh 1873
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†Apatornis celer Marsh 1873
G. †Ichthyornis Marsh 1872
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†Ichthyornis dispar Marsh 1872