& Nature Photo Galleries
1917 Print from a Painting by Charles R. Knight [15]
Restored from a Skeleton in the American Museum [14]
Leg Bones Drawing [11]
Left - fore leg
Right - hind leg
Skull Drawing [10]
By Ghedoghedo [12],
via Wikimedia Commons
Skeleton [13]
Hyracotherium vasacciense
Lower Teeth (fossil)
1838 Fd. location Unknown, USA
________________________
 
[1] https://en.Wikipedia.org/wiki/Hyracotherium
[2] https://www.thoughtco.com/prehistoric-horses-everyone-should-know-1093346
[3] Scott, William, A History of Land Mammals in the Western Hemisphere, (New York: The MacMillian Co., 1913), 302
[4] Bennet, Deb, The Evolution of the Horse: History and Techniques of Study, 2008, 14
[5] https://en.Wikipedia.org/wiki/Hyracotherium
[6] Ibid.
[7] Ibid.
[8] Osborn, Henry, The Age of Mammals in Europe, Asia and North America, (New York: The MacMillian Co., 1921), 555
[9] http://www.prehistoric-wildlife.com/species/h/hyracotherium.html
[10] Scott, 305
[11] Ibid. 307
[12] Licensed by [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)] 
[13] At Musee d'Histoire Naturelle, Paris
[14] Scott, 303
[15] Courtesy of the American Museum of Natural History, New York
[16] Owen, Richard, A History of British Fossil Mammals and Birds, (London: John Van Voorst, 1846), 419, 422
[17] Granger, Walter, Article XV - A Revision of the American Eocene Horses, (American Museum of Natural History,1908), 241 [18] Ibid. 260
[19] Osborn, Henry, The Age of Mammals in Europe, Asia and North America, (New York: The MacMillian Co., 1921), 116
Upper and Lower Teeth Drawing [5]
Eohippus resartus
Upper Right to Left P2 to M3
Lower Right to Left p3 to m3
Fd. Big Horn Basin, Wyoming, USA
Upper
Lower
Upper Teeth Drawing [16]
Eohippus venticolus
Left to Right P2 to M3
Copyright 2018 All rights reserved.
Skull [16]
Hyracotherium leporinum
Fd. in London Clay at Studd Hill about one mile west of Herne Bay, England circa 1839
Skull [19]
Hyracotherium (Pliolophus) vulpiceps
Fd. London Clay, England
Upper Teeth (fossil)
Sifrhippus Sandrae?
M2 and M3?
1845 Fd. Big Horn Basin on surface of Willwood formation near Worland,Wyoming, USA
Hyracotherium (Eohippus)
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Size

Averaged 2.5 feet long [1], about two feet high at the shoulder [2], ranging in size from a cat to a fox [3] 

Eye sockets

Incomplete bony rim, about 0.46 of skull length from front of skull to center of socket 

Type of teeth

Low crowned, enamel over dentine [4], five grinding teeth [5] 

Toes

Four on each foreleg and three on each hindleg [6] 

Hooves/pads

Each toe had a pad like a dog[7] 

Locations found

Europe [8], including England, and Colorado, Utah and Wyoming, USA 

Other

Back very arched upward

Eighteen rib pairs from the photo below

Small diastema (gap) near front of mouth [9]

Dental formula 3.1.4.3/3.1.4.3 

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)