Mesohippus
Restoration by Heinrich Harder
Restoration by Charles R. Knight [11]
Restoration by R. Bruce Horsfall [12]
from skeleton in the American Museum
Mesohippus bairdi
Fd. White River
Reconstructed Skeleton
Mesohippus barbouri
Harvard Museum of Natural History
Photo by David Starner [9]
Photo by Ghedoghedo [10]
Reconstructed Skeleton
Mesohippus bairdi
Museo di Paleontologia di Firenze, Italy
Upper Premolars P1, P2 and P3 (fossil)
Mesohippus bairdi
1837 Fd. Brule Formation, White River Badlands, Pennington Co., South Dakota, USA
Lower Premolars p1, p2 and p3 (fossil)
Mesohippus bairdi
1813 Fd. private land, Pennington Co.,
South Dakota, USA
Upper Premolars and Molars (fossil)
1112 Fd. South Dakota, USA
Lower Teeth p4, m1 and, m2
partially erupted (fossil)
Mesohippus bairdi
1813 Fd. private land, Pennington Co.,
South Dakota, USA
Hind Leg [13]
Mesohippus sejunctus
Left to Right - side view, front view, hoof
core rear end and bottom views
Fd. Pawnee Creek beds near Pawnee Buttes, Colorado, USA
Skull Cast
Mesohippus bairdi
Original Fd. White River Formation, Nebraska, USA
7.5" long
Upper Very Worn Upper Teeth (fossil)
Mesohippus bairdi
2052 Fd. Brule Formation, White River Badlands, Pennington Co., South Dakota, USA
Low crown tooth construction is an enamel
coating over dentine with narrow roots.
Lower Tooth (fossil)
Mesohippus or Miohippus?
1573 Fd. Willford Formation, Badlands, Southwest of Laramie, Wyoming, USA
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[1] http://en.wikipedia.org/wiki/Mesohippus
[2] Bennet, Deb, The Evolution of the Horse: History and Techniques of Study, 2008, 14
[3] wikipedia, Ibid.
[4] Ibid.
[5] Bennet,14
[6] Simpson, George, Horses, (Garden City, New York: Doubleday & Company, Inc., 1961), 258
[7] wikipedia, Ibid.
[8] Masciale, David M., An Analysis of Anchitherine Equids Across the Eocene-Oligocene Boundary in the White River Group of the Western Great Plains, (2010). Dissertations A & Theses in Earth and  Atmospheric Sciences. 11. http://digitalcommons .unl.edu/geoscidiss/11
[9] Wikipedia Commons,[CC BY 3.0 (https://creativecommons.org/licenses/by/3.0)]
[10] Wikipedia Commons, [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)] )] )]
[11] Osborn, Henry, The Age of Mammals in Europe, Asia and North America, (New York: The MacMillian Co., 1921), 223 
[12] Scott, William, A History Land Mammals in the Western Hemisphere, (New York: The MacMillian Co., 1913), 300
[13] Cope, Edward and Matthew, William, Hitherto Unpublished Plates of Tertiary Mammalia and Permian Vertebrata, (United States Government for the American Museum of Natural History), Plate CLI  
Perissodactyla/Equidae/Anchitheriiane

 

Size

About 2 feet tall and up to 4 feet long [1]

Eye sockets

Incomplete bony rim, about 0.52 of skull length from front of skull to center of socket

Type of teeth

Low-crowned, enamel coating over dentine [2], six grinding teeth [3]

Toes

All legs have 3 toes [4]

Hooves/pads

Pads[5], [6]

Locations found

Common in North America [7]

Other

Seventeen rib pairs per skeletons below?

Perhaps a junior synonym for Miohippus [8]

Horse Evolution?
Anchippus
Anchitherium
Equus 1 (Recent)
Equus 2 (Recent)
Equus 1 (Fossils)
Equus 2 (Fossils)
Hipparion
Hippidion
Hypohippus
Kalobatippus
Merychippus
Mesohippus
Miohippus
Nannippus
Neohipparion
Orohippus
Parahippus
Pliohippus
Protohippus
Protorohippus
Unidentified
Hyracotherum (Eohippus)