Opinions from D. C. Woodruff et al. 2021
- 'Acrotholus belongs to Pachycephalosaurinae'
- 'Alaskacephale belongs to Pachycephalosaurinae'
- 'Alaskacephale gangloffi belongs to Alaskacephale'
- 'Amtocephale belongs to Pachycephalosaurinae'
- 'Amtocephale gobiensis belongs to Amtocephale'
- 'Colepiocephale belongs to Pachycephalosauridae'
- 'Dracorex belongs to Pachycephalosaurini'
- 'Dracorex hogwartsia [misspelled as Dracorex hogswartsia] belongs to Dracorex'
- 'Foraminacephale belongs to Pachycephalosaurinae'
- 'Goyocephale belongs to Pachycephalosaurinae'
- 'Goyocephale lattimorei belongs to Goyocephale'
- 'Hanssuesia belongs to Pachycephalosauridae'
- 'Homalocephale belongs to Pachycephalosaurinae'
- 'Homalocephale calathocercos belongs to Homalocephale'
- 'Pachycephalosauridae belongs to Pachycephalosauria'
- 'Pachycephalosaurinae belongs to Pachycephalosauridae'
- 'Pachycephalosaurini belongs to Pachycephalosaurinae'
- 'Pachycephalosaurus belongs to Pachycephalosaurini'
- '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 is recombined as Foraminacephale brevis'
- 'Stegoceras lambei is recombined as Colepiocephale lambei'
- 'Stegoceras novomexicanum belongs to Stegoceras'
- 'Stegoceras validus is corrected as Stegoceras validum and belongs to Stegoceras'
- 'Stygimoloch belongs to Pachycephalosaurini'
- 'Stygimoloch spinifer belongs to Stygimoloch'
- 'Troodon edmontonensis is recombined as Sphaerotholus edmontonensis'
- 'Troodon sternbergi is recombined as Hanssuesia sternbergi'
- 'Troodon wyomingensis is recombined as Pachycephalosaurus wyomingensis'
- 'Tylocephale belongs to Pachycephalosaurinae'
- 'Wannanosaurus belongs to Pachycephalosauria'