Opinions from J. H. Ostrom 1980
- 'Anchisauridae belongs to Prosauropoda'
- 'Ankylosauria belongs to Ornithischia'
- 'Ankylosauridae belongs to Ankylosauria'
- 'Brachiosauridae belongs to Sauropoda'
- 'Carnosauria belongs to Theropoda'
- 'Ceratopsia belongs to Ornithischia'
- 'Ceratopsidae belongs to Ceratopsia'
- 'Coeluridae belongs to Coelurosauria'
- 'Coelurosauria belongs to Theropoda'
- 'Compsognathidae belongs to Coelurosauria'
- 'Dromaeosauridae belongs to Coelurosauria'
- 'Hadrosauridae belongs to Ornithopoda'
- 'Heterodontosauridae belongs to Ornithopoda'
- 'Hypsilophodontidae belongs to Ornithopoda'
- 'Iguanodontidae belongs to Ornithopoda'
- 'Megalosauri is corrected as Megalosauridae and belongs to Carnosauria'
- 'Melanorosauridae belongs to Prosauropoda'
- 'Nodosauridae belongs to Ankylosauria'
- 'Ornithischia belongs to Archosauria'
- 'Ornithomimidae belongs to Coelurosauria'
- 'Ornithopoda belongs to Ornithischia'
- 'Oviraptoridae belongs to Coelurosauria'
- 'Pachycephalosauridae belongs to Ornithopoda'
- 'Plateosauridae belongs to Prosauropoda'
- 'Podokesauridae belongs to Coelurosauria'
- 'Prosauropoda belongs to Sauropodomorpha'
- 'Protoceratopsidae belongs to Ceratopsia'
- 'Psittacosauridae belongs to Ornithopoda'
- 'Saurischia belongs to Archosauria'
- 'Sauropoda belongs to Sauropodomorpha'
- 'Sauropodomorpha belongs to Saurischia'
- 'Scelidosauridae belongs to Stegosauria'
- 'Segisauridae belongs to Coelurosauria'
- 'Stegosauria belongs to Ornithischia'
- 'Stegosauridae belongs to Stegosauria'
- 'Therizinosauridae belongs to Carnosauria'
- 'Theropoda belongs to Saurischia'
- 'Titanosauridae belongs to Sauropoda'
- 'Tyrannosauridae belongs to Carnosauria'