Hesperornis

Hesperornis Temporal range: Late Cretaceous, 83.5–78 Ma PreЄ Є O S D C P T J K Pg N
Restored skeleton of H. regalis
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	†Hesperornithes
Family:	†Hesperornithidae
Genus:	†Hesperornis Marsh, 1872
Type species
†Hesperornis regalis Marsh, 1872
Species
†H. regalis Marsh, 1872 †H. crassipes (Marsh, 1876) †H. gracilis Marsh, 1876 †H. altus (Marsh, 1893) †H. montana Schufeldt, 1915 †H. rossicus Nesov & Yarkov, 1993 †H. bairdi Martin & Lim, 2002 †H. chowi Martin & Lim, 2002 †H. macdonaldi Martin & Lim, 2002 †H. mengeli Martin & Lim, 2002 †H. lumgairi Aotsuka & Sato, 2016 (in press)
Synonyms
Lestornis Marsh, 1876 Coniornis Marsh, 1893 Hargeria Lucas, 1903

†H. regalis Marsh, 1872
†H. crassipes (Marsh, 1876)
†H. gracilis Marsh, 1876
†H. altus (Marsh, 1893)
†H. montana Schufeldt, 1915
†H. rossicus Nesov & Yarkov, 1993
†H. bairdi Martin & Lim, 2002
†H. chowi Martin & Lim, 2002
†H. macdonaldi Martin & Lim, 2002
†H. mengeli Martin & Lim, 2002
†H. lumgairi Aotsuka & Sato, 2016 (in press)

Lestornis Marsh, 1876
Coniornis Marsh, 1893
Hargeria Lucas, 1903

Hesperornis (meaning "western bird") is a genus of flightless aquatic birds that spanned the first half of the Campanian age of the Late Cretaceous period (83.5–78 mya). One of the lesser-known discoveries of the paleontologist O. C. Marsh in the late 19th century Bone Wars, it was an early find in the history of avian paleontology. Locations for Hesperornis fossils include the Late Cretaceous marine limestones from Kansas and the marine shales from Canada. Nine species are recognised, eight of which have been recovered from rocks in North America and one from Russia.