Classification of the genus Hesperornis
G. †Hesperornis Marsh 1872
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†Hesperornis altus Marsh 1893
†Hesperornis bairdi Martin and Lim 2002
†Hesperornis chowi Martin and Lim 2002
†Hesperornis crassipes Marsh 1876
†Hesperornis gracilis Marsh 1876
†Hesperornis lumgairi Aotsuka and Sato 2016
†Hesperornis macdonaldi Martin and Lim 2002
†Hesperornis mengeli Martin and Lim 2002
†Hesperornis montanus Shufeldt 1915
†Hesperornis regalis Marsh 1872
†Hesperornis rossicus Nessov and Yarkov 1993
Invalid names: Coniornis Marsh 1893 [synonym], Hargeria Lucas 1903 [synonym], Lestornis Marsh 1876 [synonym]