Cretaceous
Acrotholus
Acrotholus audeti
The catalogue presents Acrotholus as a herbivore member of Pachycephalosauridae that lived during the Cretaceous, between 82.7–79.5 Ma. Its estimated range is 1.8 m in length and 40 kg in mass, giving a practical sense of scale. Reference material comes from Milk River Formation, Alberta, Canada. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Acrotholus, the PBDB records the taxonomic attribution as Evans et al. (2013).
The PBDB places it in Pachycephalosaurinae, and the catalogue record assigns it to the family Pachycephalosauridae.
- PBDB · taxon.parent
- Pachycephalosauridae
In the PBDB record, the reported stratigraphic range is the Santonian.
The PBDB catalogues 1 occurrence, with material from the Milk River Formation (1). Provenance: Canada.
The catalogue records the holotype as ROM 75420 and the type locality as “Milk River Formation, Alberta, Canada”.
- ROM 75420
- Milk River Formation, Alberta, Canada
The catalogue's reference measurements are 1.8 m in length and 40 kg in mass — estimates, which vary with specimen and method.
- 1.8 m
- 40 kg
The record gathers 2 bibliographic references registered in the PBDB, listed below.
Where it lived
Fossil occurrences on today’s map and in the tectonic reconstruction.
Positions reconstructed by PBDB/GPlates, not observed; this is not an exact habitat map.
Artistic 3D reconstruction
There is no approved species-specific 3D model yet. Generic anatomy will not be presented as if it were evidence.
Physical Specifications
- Length
- 1.8 m
- Weight
- 40 kg
- Period
- Cretaceous
- Time range
- 82.7–79.5 Ma
Discovery Information
- First Discovery
- 2013
- Described by
- Evans et al.
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Ornithischia
- Family
- Pachycephalosauridae
- Genus
- Acrotholus
- Species
- A. audeti
Data status
Taxonomic name matched to PBDB and checked on 2026-08-08.
Taxonomic linkage does not automatically validate size, mass, behaviour or appearance.
- Type specimen
- ROM 75420
- Type locality
- Milk River Formation, Alberta, Canada