CerapodaDinosauriaLate CretaceousMarginocephaliaNeornithischiaNorth AmericaOrnithischiaPachycephalosauriaPachycephalosauridaePachycephalosaurinaeParapredentataPrionodontiaSulcimentisauria

Sphaerotholus lyonsi

Dinosaur: Sphaerotholus lyonsi

Length*: 1.95 m 6.4 ft
Weight*: 28 kg 62 lb
*The largest known specimen

ESR: 1 / 4 (estimated size reliability)


Material: Nearly complete right squamosal.
References: Woodruff, D. Cary; Schott, Ryan K.; Evans, David C. (2023). "Two new species of small‐bodied pachycephalosaurine (Dinosauria, Marginocephalia) from the uppermost Cretaceous of North America suggest hidden diversity in well‐sampled formations".


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