Every month, 100,000 readers use the Dinosaur Database, but we receive no support from you. Developing and updating the database requires a lot of work. Therefore, as of September 1, 2025, the database will be closed. If you want it to remain open and be updated, please support us via the "Buy us a coffee" button available on every page or via the Support page.
Dinosaur: Stegosaurus ungulatus

Length*: | 9.3 m | 30.5 ft |
Weight*: | 6 t | 13,228 lb |
*The largest known specimen
Period
Epoch: Late Jurassic
Stage: Early Tithonian
Years: 149.2–145 Ma
Details
Status: valid /S > Stegosaurus stenops
Author: Marsh
Year: 1879
Distribution
Area: North America
Country: USA
Region: Wyoming
Formation: Morrison
Locations
Sources
Material: Several individuals ? (problematic all material may belong to Stegosaurus stenops).
References: Maidment, S.C.R., Brassey, C., Barrett, P.M. (2015). "The Postcranial Skeleton of an Exceptionally Complete Individual of the Plated Dinosaur Stegosaurus stenops (Dinosauria: Thyreophora) from the Upper Jurassic Morrison Formation of Wyoming.