Opinions from P. C. Sereno 2000

  • 'Archaeoceratops belongs to Neoceratopsia'
  • 'Archaeoceratops oshimai belongs to Archaeoceratops'
  • 'Asiaceratops is a nomen dubium'
  • 'Asiaceratops salsopaludalis is a nomen dubium'
  • 'Bagaceratops belongs to Protoceratopsidae'
  • 'Bagaceratops rozhdestvenskyi belongs to Bagaceratops'
  • 'Breviceratops is a subjective synonym of Bagaceratops'
  • 'Centrosaurinae belongs to Ceratopsidae'
  • 'Ceratopsia was reranked as a unranked clade and belongs to Marginocephalia'
  • 'Ceratopsidae belongs to Ceratopsoidea'
  • 'Ceratopsinae belongs to Ceratopsidae'
  • 'Ceratopsoidea belongs to Coronosauria'
  • 'Chaoyangsaurus belongs to Neoceratopsia'
  • 'Chaoyangsaurus youngi belongs to Chaoyangsaurus'
  • 'Coronosauria belongs to Neoceratopsia'
  • 'Domocephalinae is a nomen vanum'
  • 'Goyocephale belongs to Pachycephalosauria'
  • 'Goyocephale lattimorei belongs to Goyocephale'
  • 'Graciliceratops belongs to Protoceratopsidae'
  • 'Graciliceratops mongoliensis belongs to Graciliceratops'
  • 'Homalocephale belongs to Pachycephalosauria'
  • 'Homalocephale calathocercos belongs to Homalocephale'
  • 'Leptoceratops belongs to Neoceratopsia'
  • 'Microceratops is a nomen dubium'
  • 'Microceratops gobiensis is a nomen dubium'
  • 'Microceratops sulcidens is a nomen dubium'
  • 'Micropachycephalosaurus is a nomen dubium'
  • 'Micropachycephalosaurus hongtuyanensis is a nomen dubium'
  • 'Montanoceratops belongs to Ceratopsoidea'
  • 'Neoceratopsia belongs to Ceratopsia'
  • 'Ornatotholus belongs to Pachycephalosauria'
  • 'Pachycephalosauria was reranked as a unranked clade and belongs to Marginocephalia'
  • 'Pachycephalosauridae belongs to Pachycephalosauria'
  • 'Pachycephalosaurinae belongs to Pachycephalosauridae'
  • 'Pachycephalosaurus belongs to Pachycephalosaurinae'
  • 'Prenocephale belongs to Pachycephalosaurinae'
  • 'Prenocephale prenes belongs to Prenocephale'
  • 'Protoceratops belongs to Protoceratopsidae'
  • 'Protoceratops andrewsi belongs to Protoceratops'
  • 'Protoceratops kozlowskii is a subjective synonym of Bagaceratops rozhdestvenskyi'
  • 'Protoceratopsidae belongs to Coronosauria'
  • 'Psittacosaurus belongs to Ceratopsia'
  • 'Psittacosaurus mazongshanensis is a nomen dubium'
  • 'Psittacosaurus meileyingensis belongs to Psittacosaurus'
  • 'Psittacosaurus mongoliensis belongs to Psittacosaurus'
  • 'Psittacosaurus sattayaraki is a nomen dubium'
  • 'Stegoceras belongs to Pachycephalosauridae'
  • 'Stenopelix belongs to Pachycephalosauria'
  • 'Stenopelix valdensis belongs to Stenopelix'
  • 'Stygimoloch belongs to Pachycephalosaurinae'
  • 'Tholocephalidae is a nomen vanum'
  • 'Turanoceratops belongs to Ceratopsoidea'
  • 'Turanoceratops tardabilis belongs to Turanoceratops'
  • 'Tylocephale belongs to Pachycephalosaurinae'
  • 'Tylocephale gilmorei belongs to Tylocephale'
  • 'Udanoceratops belongs to Neoceratopsia'
  • 'Udanoceratops tschizhovi belongs to Udanoceratops'
  • 'Wannanosaurus belongs to Pachycephalosauria'
  • 'Wannanosaurus yansiensis belongs to Wannanosaurus'
  • 'Yaverlandia belongs to Pachycephalosauria'