Opinions from T. E. Williamson and T. D. Carr 2003

  • 'Goyocephale belongs to Pachycephalosauria'
  • 'Goyocephale lattimorei belongs to Goyocephale'
  • 'Gravitholus is a subjective synonym of Stegoceras'
  • 'Gravitholus albertae is a nomen dubium'
  • 'Homalocephale belongs to Pachycephalosauria'
  • 'Homalocephale calathocercos belongs to Homalocephale'
  • 'Ornatotholus is a nomen dubium'
  • 'Pachycephalosauridae belongs to Pachycephalosauria'
  • 'Pachycephalosaurinae belongs to Pachycephalosauridae'
  • 'Pachycephalosaurus belongs to Pachycephalosaurinae'
  • 'Prenocephale belongs to Pachycephalosaurinae'
  • 'Prenocephale prenes belongs to Prenocephale'
  • 'Sphaerotholus belongs to Pachycephalosaurinae'
  • 'Sphaerotholus buchholtzae belongs to Sphaerotholus'
  • 'Sphaerotholus goodwini belongs to Sphaerotholus'
  • 'Stegoceras belongs to Pachycephalosauridae'
  • 'Stegoceras brevis belongs to Stegoceras'
  • 'Ornatotholus browni is a nomen dubium'
  • 'Stegoceras lambei belongs to Stegoceras'
  • 'Stegoceras validus is corrected as Stegoceras validum and belongs to Stegoceras'
  • 'Stenopelix belongs to Pachycephalosauria'
  • 'Stenopelix valdensis belongs to Stenopelix'
  • 'Stygimoloch belongs to Pachycephalosaurinae'
  • 'Stygimoloch spinifer belongs to Stygimoloch'
  • 'Stegoceras edmontonense is a nomen dubium'
  • 'Troodon sternbergi is recombined as Stegoceras sternbergi'
  • 'Troodon wyomingensis is recombined as Pachycephalosaurus wyomingensis'
  • 'Tylocephale belongs to Pachycephalosaurinae'
  • 'Tylocephale gilmorei belongs to Tylocephale'
  • 'Wannanosaurus belongs to Pachycephalosauria'
  • 'Wannanosaurus yansiensis belongs to Wannanosaurus'
  • 'Yaverlandia belongs to Pachycephalosauria'
  • 'Yaverlandia bitholus belongs to Yaverlandia'