Phenacodus
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Phenacodus is an extinct genus of mammals from the late Paleocene through middle Eocene, about 55 million years ago. It is one of the earliest and most primitive of the ungulates, typifying the family
Phenacodus AMNH
P. primaevus, closeup of skull.
Restoration by Charles R. Knight
Skeleton of Phenacodus primaevus
Perissodactyla
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Perissodactyla, or odd-toed ungulates, is an order of ungulates. The order includes about 17 living species divided into three families: Equidae, Rhinocerotidae, and Tapiridae. They typically have red
Phenacodus
…Eocene, about 55 million years ago. It is one of the earliest and most primitive of the ungulates, typifying the family Phenacodontidae and the order Perissodactyla. The skull was small, with proportionately minute brain; and the arched back, strong lumbar vertebrae, long and powerful tail, and comparatively feeble…
The Perissodactyl
The white rhinoceros is the largest living perissodactyl
Seven figures showing the bones, blood vessels, ligaments and arteries of the hoof and pastern of the horse.
Tapirs are the only extant group of perissodactyls with a trunk.