Stylemys (meaning "pillar turtle") is the first fossil genus of dry land tortoise belonging to the order Testudines discovered in the United States.

The genus lived in temperate to subtropical areas of North America, Europe, and Asia, based on fossil distribution.

[2] The tortoise was common in the prehistoric Badlands, especially Nebraska and South Dakota.

Fossil fragments have also been found in the Palm Park Formation of New Mexico.

[4] Eon: Phanerozoic Era: Cenozoic Period: Paleogene Epoch: Eocene