Leptomeryx is an extinct genus of ruminant of the family Leptomerycidae, endemic to North America during the Eocene through Oligocene 38–24.8 Mya, existing for approximately . It was a small deer-like ruminant with somewhat slender body.
Fossil distribution
Sites and species recovered:
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Titus Canyon, Inyo County, California (L.blacki) ~30.6—33.9 Ma.
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Anxiety Butte, Saskatchewan, Canada (L. sp., L. evansi) ~38—24.8 Ma.
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Calf Creek, Saskatchewan, Canada, (L. mammifer) ~38—33.3 Ma.
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Toadstool Park, Sioux County, Nebraska (L. speciosus) ~37.2—33.3 Ma.
[ Paleobiology database: Toadstool Park collection]
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Medicine Pole Hills, Bowman County, North Dakota (L. yoderi) ~38—33.9 Ma.
[ Paleobiology database: Medicine Pole Hills collection]
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Webb, S.D., 1998. Hornless ruminants. pp. 463–476 in C.M. Janis, K.M. Scott, and L.L. Jacobs ( eds.) Evolution of Tertiary Mammals of North America. Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Cambridge University Press, Cambridge.
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Heaton, T.H. and Emry, R.J., 1996. Leptomerycidae pp. 581–608 in D.R. Prothero and R.J. Emry ( eds.) The Terrestrial Eocene-Oligocene Transition in North America. Cambridge University Press, Cambridge.
