Opinions from T. M. Lehman 1981
- 'Alamosaurus belongs to Titanosauridae'
- 'Alamosaurus sanjuanensis belongs to Alamosaurus'
- 'Albertosaurus belongs to Tyrannosauridae'
- 'Arrhinoceratops utahensis is recombined as Torosaurus utahensis'
- 'Centrosaurus belongs to Ceratopsidae'
- 'Ceratops belongs to Ceratopsidae'
- 'Chasmosaurus belongs to Ceratopsidae'
- 'Deinodon is a nomen dubium'
- 'Eoceratops belongs to Ceratopsidae'
- 'Hadrosaurus belongs to Hadrosauridae'
- 'Kritosaurus is a subjective synonym of Hadrosaurus'
- 'Kritosaurus navajovius is recombined as Hadrosaurus navajovius'
- 'Monoclonius belongs to Ceratopsidae'
- 'Monoclonius canadensis is recombined as Eoceratops canadensis'
- 'Palaeoscincus rugosidens is recombined as Panoplosaurus rugosidens'
- 'Panoplosaurus belongs to Nodosauridae'
- 'Parasaurolophus belongs to Hadrosauridae'
- 'Parasaurolophus cyrtocristatus belongs to Parasaurolophus'
- 'Parasaurolophus tubicen belongs to Parasaurolophus'
- 'Parksosaurus belongs to Hypsilophodontidae'
- 'Paronychodon belongs to Coeluridae'
- 'Paronychodon lacustris belongs to Paronychodon'
- 'Pentaceratops belongs to Ceratopsidae'
- 'Pentaceratops sternbergii belongs to Pentaceratops'
- 'Saurornithoides belongs to Saurornithoididae'
- 'Saurornithoides junior belongs to Saurornithoides'
- 'Stenonychosaurus inequalis belongs to Stenonychosaurus'
- 'Thescelosaurus warreni is recombined as Parksosaurus warreni'
- 'Torosaurus belongs to Ceratopsidae'
- 'Triceratops belongs to Ceratopsidae'