Cerapoda Dinosauria Genasauria Late Cretaceous Marginocephalia Neornithischia North America Ornithischia Pachycephalosauria Pachycephalosauridae Pachycephalosaurinae

Sphaerotholus buchholtzae

Dinosaur: Sphaerotholus buchholtzae

Cretaceous: 72.1–66 Ma

Type: Pachycephalosauria

*Length:**	1.8 m	5.9 ft
*Weight:**	30 kg	66 lb

ESR: 2 / 4 (estimated size reliability)
*The largest known specimen

Area: North America

Period

Epoch: Late Cretaceous
Stage: Late Maastrichtian
Years: 72.1–66 Ma

Details

Status: valid
Author: Williamson & Carr
Year: 2002

Distribution

Area: North America
Country: USA, Canada
Region: Montana, North Dakota, South Dakota, Saskatchewan
Formation: Hell Creek, Frenchman

Classification

Dinosauria
Ornithischia
Genasauria
Neornithischia
Cerapoda
Marginocephalia
Pachycephalosauria
Pachycephalosauridae
Pachycephalosaurinae

Sources

Material: Partial skull. Referred more than 20 individuals.
References: Williamson, T. E., & Carr, T. D. (2002). A new genus of derived pachycephalosaurian from western North America. Mallon, J. C., Evans, D. C., Tokaryk, T. T., & Currie, M. L. (2015). First pachycephalosaurid (Dinosauria: Ornithischia) from the Frenchman Formation (upper Maastrichtian) of Saskatchewan, Canada. D. Cary Woodruff, Mark B. Goodwin, Tyler R. Lyson & David C. Evans (2021). Ontogeny and variation of the pachycephalosaurine dinosaur Sphaerotholus buchholtzae, and its systematics within the genus.

Locations

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