[1]
[1]

Wannanosaurus

Pachycephalosauridae

Colepiocephale

Hanssuesia

Stegoceras

Goyocephale

Homalocephale

Tylocephale

Foraminacephale

Amtocephale

Acrotholus

Prenocephale

Alaskacephale

Pachycephalosaurus

Sphaerotholus

  1. ^ a b Evans, D. C.; Schott, R. K.; Larson, D. W.; Brown, C. M.; Ryan, M. J. (2013). “The oldest North American pachycephalosaurid and the hidden diversity of small-bodied ornithischian dinosaurs”. Nature Communications 4: 1828. Bibcode:2013NatCo...4.1828E. PMID 23652016. doi:10.1038/ncomms2749