Opinions from H. You and P. Dodson 2004

  • 'Archaeoceratops belongs to Neoceratopsia'
  • 'Archaeoceratops oshimai belongs to Archaeoceratops'
  • 'Asiaceratops is a nomen dubium'
  • 'Asiaceratops salsopaludalis is a nomen dubium'
  • 'Bagaceratops rozhdestvenskyi belongs to Bagaceratops'
  • 'Breviceratops is a subjective synonym of Bagaceratops'
  • 'Chaoyangsaurus belongs to Neoceratopsia'
  • 'Chaoyangsaurus youngi belongs to Chaoyangsaurus'
  • 'Graciliceratops belongs to Neoceratopsia'
  • 'Graciliceratops mongoliensis belongs to Graciliceratops'
  • 'Kulceratops is a nomen dubium'
  • 'Kulceratops kulensis is a nomen dubium'
  • 'Leptoceratops belongs to Neoceratopsia'
  • 'Leptoceratops cerorhynchus is recombined as Montanoceratops cerorhynchus'
  • 'Leptoceratops gracilis belongs to Leptoceratops'
  • 'Liaoceratops belongs to Neoceratopsia'
  • 'Liaoceratops yanzigouensis belongs to Liaoceratops'
  • 'Microceratops is a nomen dubium'
  • 'Microceratops gobiensis is a nomen dubium'
  • 'Microceratops sulcidens is a nomen dubium'
  • 'Montanoceratops belongs to Neoceratopsia'
  • 'Neoceratopsia belongs to Ceratopsia'
  • 'Protiguanodon is a subjective synonym of Psittacosaurus'
  • 'Protiguanodon mongoliense is a subjective synonym of Psittacosaurus mongoliensis'
  • 'Protoceratops belongs to Neoceratopsia'
  • 'Protoceratops andrewsi belongs to Protoceratops'
  • 'Protoceratops hellenikorhinus belongs to Protoceratops'
  • 'Breviceratops kozlowskii is a subjective synonym of Bagaceratops rozhdestvenskyi'
  • 'Psittacosauridae belongs to Ceratopsia'
  • 'Psittacosaurus belongs to Psittacosauridae'
  • 'Psittacosaurus guyangensis belongs to Psittacosaurus'
  • 'Psittacosaurus mazongshanensis belongs to Psittacosaurus'
  • 'Psittacosaurus meileyingensis belongs to Psittacosaurus'
  • 'Psittacosaurus mongoliensis belongs to Psittacosaurus'
  • 'Psittacosaurus neimongoliensis belongs to Psittacosaurus'
  • 'Psittacosaurus ordosensis belongs to Psittacosaurus'
  • 'Psittacosaurus osborni belongs to Psittacosaurus'
  • 'Psittacosaurus sattayaraki is a nomen dubium'
  • 'Psittacosaurus sinensis belongs to Psittacosaurus'
  • 'Psittacosaurus tingi is a subjective synonym of Psittacosaurus osborni'
  • 'Psittacosaurus xinjiangensis belongs to Psittacosaurus'
  • 'Psittacosaurus youngi belongs to Psittacosaurus'
  • 'Turanoceratops is a nomen dubium'
  • 'Turanoceratops tardabilis is a nomen dubium'
  • 'Udanoceratops belongs to Neoceratopsia'
  • 'Udanoceratops tschizhovi belongs to Udanoceratops'
  • 'Zuniceratops belongs to Neoceratopsia'
  • 'Zuniceratops christopheri belongs to Zuniceratops'