Subfamily
Valid Extinct

Pachycephalosaurinae

Sereno 1997

No Wikipedia summary available.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
18
Group
Dinosaures
Herbivore Ground dwelling, gregarious Terrestrial
Pachycephalosaurinae
click to enlarge
Montage of four pachycephalosaurs. Clockwise from top left: Stegoceras, Prenocephale, Pachycephalosaurus and Homalocephale. These files are already on Commons with their respective licenses. This montage was made for the article Pachycephalosauria on Wikipedia. File:Stegoceras mount.jpg File:Dinosauria - Prenocephale.jpg File:Fossil Pachycephalosaurus.jpg File:Homalocephale skull.jpg © PaleoNeolitic (montage creator) Lewis Kelly Tylwyth Eldar Momotarou2012 FunkMonk · CC BY 4.0 · Wikimedia
PBDB ↗
Classification
Dinosauria Unranked clade
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Ornithischia Unranked clade
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Neornithischia Unranked clade
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Pyrodontia Unranked clade
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Cerapoda Unranked clade
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Marginocephalia Unranked clade
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Pachycephalosauria Suborder
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Pachycephalosauridae Family
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Pachycephalosaurinae Subfamily
Fossil sites 18 geolocated sites
Distribution
Top countries
🇨🇦 Canada
11
🇺🇸 United States
7
Geological formations
Two Medicine
3
Dinosaur Park
3
Hell Creek
3
Frenchman
2
Milk River
1
Kirtland
1
Oldman
1
Temporal distribution
Maastrichtian (72.2–66 Ma)
5
Campanian (83.6–72.2 Ma)
12
Santonian (85.7–83.6 Ma)
1
Images 1
Bibliography
Original description
P. C. Sereno. 1997. The origin and evolution of dinosaurs. Annual Review of Earth and Planetary Sciences 25:435-489 DOI ↗
Bibliography (9)
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 ↗
J. R. Horner, M. B. Goodwin, and D. C. Evans. 2023. A new pachycephalosaurid from the Hell Creek Formation, Garfield County, Montana, U.S.A. Journal of Vertebrate Paleontology 42(4):e2190369:1-14 DOI ↗
D. C. Woodruff, R. K. Schott, and D. C. Evans. 2023. Two new species of small-bodied pachycephalosaurine (Dinosauria, Marginocephalia) from the uppermost Cretaceous of North America suggest hidden diversity in well-sampled formations. Papers in Palaeontology 9(6):e1535 DOI ↗
B. Moore. 2021. The Postcranial Anatomy of Pachycephalosaurs (Ornithischia: Pachycephalosauria) and Its Phylogenetic and Myological Implications. DOI ↗
J. C. Mallon, D. C. Evans, and T. T. Tokaryk, M. L. Currie. 2015. First pachycephalosaurid (Dinosauria: Ornithischia) from the Frenchman Formation (upper Maastrichtian) of Saskatchewan, Canada. Cretaceous Research 56:426-431 DOI ↗
D. C. Evans, R. K. Schott, and D. W. Larson, C. M. Brown, M. J. Ryan. 2013. The oldest North American pachycephalosaurid and the hidden diversity of small-bodied ornithischian dinosaurs. Nature Communications 4:1828 DOI ↗
T. E. Williamson and T. D. Carr. 2003. A new genus of derived pachycephalosaurian from western North America. Journal of Vertebrate Paleontology 22(4):779-801 DOI ↗
B. Brown and E. M. Schlaikjer. 1943. A study of the troödont dinosaurs with the description of a new genus and four new species. Bulletin of the American Museum of Natural History 82(5):115-150
L. M. Lambe. 1918. The Cretaceous genus Stegoceras typifying a new family referred provisionally to the Stegosauria. Proceedings and Transactions of the Royal Society of Canada, series 3 12:23-36