Genus

Valid Extinct

Brontotholus

Woodruff et al. 2025

Brontotholus is an extinct genus of pachycephalosaurid dinosaur known from the Late Cretaceous Two Medicine and Oldman formations of Montana, United States, and Alberta, Canada, respectively. The genus contains a single species, Brontotholus harmoni, known from multiple partial domes.

Temporal range

Triassic

Jurassic

Cretaceous

Paleogene

Neogene

252 201 145 66 0 Ma

PBDB occurrences

Group

Dinosaures

Herbivore Ground dwelling, gregarious Terrestrial

click to enlarge

Brontotholus is a relatively large pachycephalosaurian dinosaur. Like all pachycephalosaurs, it was bipedal and sported the characteristic bony dome on top of its skull. Brontotholus grew to nearly 4 m in length, making it one of the largest known pachycephalosaurs, and the largest from the Campanian age. © TotalDino · CC BY 4.0 · Wikimedia

PBDB ↗ Wikipedia ↗

Classification

Dinosauria Unranked clade

›

Ornithischia Unranked clade

›

Neornithischia Unranked clade

›

Pyrodontia Unranked clade

›

Cerapoda Unranked clade

›

Marginocephalia Unranked clade

›

Pachycephalosauria Suborder

›

Pachycephalosauridae Family

›

Pachycephalosaurinae Subfamily

›

Brontotholus Genus

Fossil sites 4 geolocated sites

Distribution

Top countries

🇺🇸 United States

🇨🇦 Canada

Geological formations

Two Medicine

Oldman

Temporal distribution

Campanian (83.6–72.2 Ma)

Species (1)

Brontotholus harmoni 84 Ma

Images 4

Bibliography

Original description

D. C. Woodruff, J. R. Horner, and M. B. Goodwin, D. C. Evans. 2025. The first pachycephalosaurid from the Late Cretaceous Two Medicine Formation: effects of the Western Interior Seaway on North American pachycephalosaurid evolution. Zoological Journal of the Linnean Society 205(2):zlaf087 DOI ↗

Bibliography (1)

Brontotholus

Signaler un problème