U is for Uintatherium – #AtoZChallenge – 2017 – Uintan Mammals

U is for Uintatherium

Uintatherium was a massive hoofed mammal that lived during the Eocene epoch. Superficially, they were rather rhinoceros-like, though they were not related.

A reconstruction of Uintatherium.
Credit: Dmitry Bogdanov CC 3.0 By SA

Notably, Uintatheres had many horns and protuberances on their skulls, in addition to robust tusks.

Cast of Uintatherium anceps (Leidy, 1872) – syn. Dinoceras mirabile (Marsh 1872) skull, neck vertebrae.
Credit: Jebulon [Public Domain]

O is if Ourayia – #AtoZChallenge – 2017 – Uintan Mammals

O is for Ourayia

Ourayia is a fossil primate, which, like Notoparamys, is related to tarsiers. Like many fossil mammals, it is best known for its teeth.

VPPU.011236: Ourayia uintensis: HYPODIGM. Utah. Uintah County. Kennedy’s Hole, Uinta Basin. Princeton 1895 Hatcher Expedition. Coll: Hatcher, J. B. 25 Mar 1895. Tertiary. Late Eocene. Uintan. Uinta Fm. Middle Uinta B.
Courtesy of the Peabody Museum of Natural History,
Division of Vertebrate Paleontology, Yale University; peabody.yale.edu

M is for Macrotarsius – #AtoZChallenge – 2017 – Uintan Mammals

M is for Macrotarsius

Macrotarsius is a fossil primate closely related to and similar in appearance to modern tarsiers.

Philippine Tarsier (Carlito syrichta), one of the smallest primates. This one is about 5 inches long with a tail longer than its body. Photo taken in Bohol, Philippines. Credit: mtoz CC 2.0 By SA

Modern tarsiers are unique in the structure of their back foot, specifically the ankle bones (the tarsals), hence their common name of ‘tarsier.’



L is for Leptotragulus – #AtoZChallenge – 2017 – Uintan Mammals

L is for Leptotragulus

Leptotragulus was a hoofed mammal that would have roughly looked like a deer, but were more closely related to camels and llamas. They were a member of a group called the Protoceratidae, that were unique in having horns on their snouts.

Here is a relative of Leptotragulus, Synthetoceras:

Synthetoceras tricornatus. Credit: Nobu Tamura CC 3.0 By