Classification of Olson 1975
G. †Ichthyornis Marsh 1872
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†Ichthyornis antecessor Wetmore 1962
Invalid names: Angelinornis Kashin 1972 [synonym], Plegadornis Wetmore 1962 [synonym]
Fm. †Ichthyornithidae Marsh 1873
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Invalid names: Angelinornithidae Kashin 1972 [synonym], Plegadornithidae Wetmore 1962 [synonym]