Hyracotherum

& 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

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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

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