This taxon is considered subjective synonym of
of the valid taxon Pachycephalosaurus
according to the Paleobiology Database.
See the page for Pachycephalosaurus →
Bibliography
Original description
E. B. Giffin, D. L. Gabriel, and R. E. Johnson. 1988. A new pachycephalosaurid skull (Ornithischia) from the Cretaceous Hell Creek Formation of Montana. Journal of Vertebrate Paleontology 7(4):398-407
DOI ↗