Sphaerotholus lyonsi

† Sphaerotholus lyonsi is a Late Cretaceous pachycephalosaur from the Campanian Judith River Formation of Canada. This dome-headed ornithischian is differentiated from other pachycephalosaurs by the proportions of its thickened cranial dome.

Diet & Feeding

Herbivore

Sphaerotholus lyonsi was a plant-eating dinosaur. Herbivores typically fed on ferns, cycads, conifers, and other vegetation available during their era. Many herbivorous dinosaurs developed specialized teeth and digestive systems for processing tough plant material.

Time Period

Cretaceous Late Mesozoic Era

Sphaerotholus lyonsi lived during the Cretaceous Late period of the Mesozoic Era, approximately 100.5 to 66.0 million years ago.

The final age of dinosaurs, featuring iconic species like Tyrannosaurus rex, Triceratops, and Velociraptor. Dinosaurs reached their peak diversity before the catastrophic asteroid impact at the Chicxulub crater ended the Mesozoic Era.