Opinions from P. J. Makovicky 2001
- 'Archaeoceratops belongs to Neoceratopsia'
- 'Archaeoceratops oshimai belongs to Archaeoceratops'
- 'Asiaceratops belongs to Leptoceratopsidae'
- 'Asiaceratops salsopaludalis belongs to Asiaceratops'
- 'Bagaceratops belongs to Protoceratopsidae'
- 'Bagaceratops rozhdestvenskyi belongs to Bagaceratops'
- 'Centrosaurus belongs to Ceratopsidae'
- 'Centrosaurus apertus belongs to Centrosaurus'
- 'Ceratops horridus is recombined as Triceratops horridus'
- 'Ceratopsoidea belongs to Coronosauria'
- 'Chaoyangsaurus belongs to Ceratopsia'
- 'Chaoyangsaurus youngi belongs to Chaoyangsaurus'
- 'Coronosauria belongs to Neoceratopsia'
- 'Leptoceratops belongs to Leptoceratopsidae'
- 'Leptoceratops cerorhynchus is recombined as Montanoceratops cerorhynchus'
- 'Leptoceratops gracilis belongs to Leptoceratops'
- 'Leptoceratopsinae was reranked as the family Leptoceratopsidae and belongs to Neoceratopsia'
- 'Microceratops belongs to Neoceratopsia'
- 'Microceratops gobiensis belongs to Microceratops'
- 'Montanoceratops belongs to Leptoceratopsidae'
- 'Neoceratopsia belongs to Ceratopsia'
- 'Protoceratops belongs to Protoceratopsidae'
- 'Protoceratops andrewsi belongs to Protoceratops'
- 'Protoceratopsidae belongs to Coronosauria'
- 'Psittacosaurus belongs to Ceratopsia'
- 'Psittacosaurus mongoliensis belongs to Psittacosaurus'
- 'Triceratops belongs to Ceratopsidae'
- 'Udanoceratops belongs to Leptoceratopsidae'
- 'Udanoceratops tschizhovi belongs to Udanoceratops'
- 'Zuniceratops belongs to Ceratopsoidea'
- 'Zuniceratops christopheri belongs to Zuniceratops'