Opinions from W. A. Parks 1935
- 'Albertosaurus belongs to Theropoda'
- 'Albertosaurus arctunguis belongs to Albertosaurus'
- 'Anchiceratops belongs to Ceratopsidae'
- 'Anchiceratops ornatus belongs to Anchiceratops'
- 'Ankylosaurus belongs to Nodosauridae'
- 'Arrhinoceratops belongs to Ceratopsidae'
- 'Arrhinoceratops brachyops belongs to Arrhinoceratops'
- 'Centrosaurus belongs to Ceratopsidae'
- 'Centrosaurus apertus belongs to Centrosaurus'
- 'Ceratopsia was reranked as a infraorder and belongs to Ornithischia'
- 'Ceratopsidae belongs to Ceratopsia'
- 'Chasmosaurus belongs to Ceratopsidae'
- 'Chasmosaurus brevirostris belongs to Chasmosaurus'
- 'Corythosaurus belongs to Trachodontidae'
- 'Dyoplosaurus belongs to Nodosauridae'
- 'Dyoplosaurus acutosquameus belongs to Dyoplosaurus'
- 'Edmontosaurus belongs to Trachodontidae'
- 'Edmontosaurus regalis belongs to Edmontosaurus'
- 'Gorgosaurus belongs to Theropoda'
- 'Hypacrosaurus belongs to Trachodontidae'
- 'Hypacrosaurus altispinus belongs to Hypacrosaurus'
- 'Hypsilophodontidae belongs to Ornithischia'
- 'Kritosaurus belongs to Trachodontidae'
- 'Kritosaurus incurvimanus belongs to Kritosaurus'
- 'Lambeosaurus belongs to Trachodontidae'
- 'Lambeosaurus lambei belongs to Lambeosaurus'
- 'Monoclonius belli is recombined as Chasmosaurus belli'
- 'Nodosauridae belongs to Ornithischia'
- 'Ornithischia was reranked as a suborder and belongs to Dinosauria'
- 'Ornithomimidae belongs to Theropoda'
- 'Parasaurolophus belongs to Trachodontidae'
- 'Parasaurolophus walkeri belongs to Parasaurolophus'
- 'Predentata is a subjective synonym of Ornithischia'
- 'Prosaurolophus belongs to Trachodontidae'
- 'Prosaurolophus maximus belongs to Prosaurolophus'
- 'Saurischia was reranked as a suborder and belongs to Dinosauria'
- 'Sauropoda belongs to Saurischia'
- 'Stephanosaurus intermedius is recombined as Corythosaurus intermedius'
- 'Struthiomimus belongs to Ornithomimidae'
- 'Struthiomimus brevetertius belongs to Struthiomimus'
- 'Struthiomimus currellii belongs to Struthiomimus'
- 'Struthiomimus ingens belongs to Struthiomimus'
- 'Struthiomimus samueli belongs to Struthiomimus'
- 'Tetragonosaurus belongs to Trachodontidae'
- 'Tetragonosaurus erectofrons belongs to Tetragonosaurus'
- 'Tetragonosaurus praeceps belongs to Tetragonosaurus'
- 'Theropoda was reranked as a unranked clade and belongs to Saurischia'
- 'Thescelosaurus belongs to Hypsilophodontidae'
- 'Thescelosaurus warreni belongs to Thescelosaurus'
- 'Trachodontidae belongs to Ornithischia'
- 'Tyrannosaurus belongs to Theropoda'
- 'Tyrannosaurus rex belongs to Tyrannosaurus'