Sphaerotholus
Sphaerotholus buchholtzae
Sphaerotholus is a genus of pachycephalosaurid dinosaur from the Upper Cretaceous of the western United States and Canada. To date, five species have been described: the type species, S. goodwini, from the Den-na-zin Member of the Kirtland Formation and possibly the Fossil Forest Member of the Fruitland Formation (Late Campanian) of San Juan County, New Mexico, USA; S. buchholtzae, from the Hell Creek Formation (Late Maastrichtian) of western Carter County, Montana, USA and the Frenchman Formation of Saskatchewan, Canada; S. edmontonensis, from the Horseshoe Canyon Formation of Alberta, Canada; S. lyonsi, from the Dinosaur Park Formation (Campanian) of Alberta, Canada; and S. triregnum from the Hell Creek Formation of Garfield County, Montana, USA.
- Family
- Pachycephalosauridae
- Order
- Ornithischia
- Period
- Cretaceous (77.0–66.0 Ma)
- Diet
- Herbivore
- Length
- 2.0–3.0 m
- Weight
- 50–100 kg
- Type locality
- Kirtland Formation, New Mexico, USA
- Holotype
- NMMNH P-27403
- PBDB
- txn:67681