• Pachycephalosauria
  • Wannanosaurus yansiensis
  • Yaverlandia bitholus [i. s.]
  • Goyocephalia
    • Goyocephale lattimorei
    • Micropachycephalosaurus hongtuyanensis
    • Homalocephaloidea
      • Homalocephale calathocercos
      • Ornatotholus browni
      • Pachycephalosauridae
        • Gravitholus albertae [i. s.]
        • Stegoceras edmontonense
        • Stegoceras validum*
        • Pachycephalosaurinae
          • Microcephale
          • Pachycephalosaurini
            • Pachycephalosaurus wyomingensis
            • Stygimoloch spinifer
          • ---
            • Prenocephale prenes
            • Tylocephale gilmorei

---


Revised: January 25, 1999; New: January 1, 1996