Opinions from O. Lambert et al. 2001
- 'Archaeoceratops belongs to Neoceratopsia'
- 'Archaeoceratops oshimai belongs to Archaeoceratops'
- 'Asiaceratops belongs to Neoceratopsia'
- 'Asiaceratops salsopaludalis belongs to Asiaceratops'
- 'Bagaceratops belongs to Protoceratopsidae'
- 'Bagaceratops rozhdestvenskyi belongs to Bagaceratops'
- 'Breviceratops is a subjective synonym of Bagaceratops'
- 'Ceratopsia belongs to Marginocephalia'
- 'Ceratopsidae belongs to Ceratopsoidea'
- 'Ceratopsoidea belongs to Neoceratopsia'
- 'Chaoyangsaurus youngi belongs to Chaoyangsaurus'
- 'Graciliceratops belongs to Neoceratopsia'
- 'Graciliceratops mongoliensis belongs to Graciliceratops'
- 'Marginocephalia belongs to Ornithischia'
- 'Microceratops is a nomen dubium'
- 'Microceratops gobiensis is a nomen dubium'
- 'Microceratops sulcidens is a nomen dubium'
- 'Montanoceratops belongs to Ceratopsoidea'
- 'Neoceratopsia belongs to Ceratopsia'
- 'Oviraptor philoceratops belongs to Oviraptor'
- 'Protoceratops belongs to Protoceratopsidae'
- 'Protoceratops andrewsi belongs to Protoceratops'
- 'Protoceratops hellenikorhinus belongs to Protoceratops'
- 'Breviceratops kozlowskii is a subjective synonym of Bagaceratops rozhdestvenskyi'
- 'Protoceratopsidae belongs to Neoceratopsia'
- 'Saurornithoides mongoliensis belongs to Saurornithoides'
- 'Turanoceratops belongs to Neoceratopsia'
- 'Turanoceratops tardabilis belongs to Turanoceratops'
- 'Udanoceratops belongs to Neoceratopsia'
- 'Udanoceratops tschizhovi belongs to Udanoceratops'
- 'Velociraptor mongoliensis belongs to Velociraptor'