Hyracotherum

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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

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[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

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