They lived in the Early Miocene period, around 20.4–15.97 million years ago and possibly earlier.

[2] Their range was principally in what is now known as Florida, United States, and possibly extending into southeastern Texas.

[3][4] It is a small alligator with an estimated body length of 2.6 metres (8.5 ft).

[5] Alligator olseni is a member of the subfamily Alligatorinae, within the larger family Alligatoridae.

This article about a prehistoric archosaur is a stub.