Opinions from A. Bartholomai and R. E. Molnar 1981
- 'Syngonosaurus macrocercus is a subjective synonym of Eucercosaurus tanyspondylus'
- 'Camptosaurus amplus is a subjective synonym of Camptosaurus dispar'
- 'Camptonotus dispar is recombined as Camptosaurus dispar'
- 'Camptosaurus belongs to Iguanodontidae'
- 'Camptosaurus browni is a subjective synonym of Camptosaurus dispar'
- 'Camptosaurus depressus belongs to Camptosaurus'
- 'Camptosaurus medius is a subjective synonym of Camptosaurus dispar'
- 'Camptosaurus nanus is a subjective synonym of Camptosaurus dispar'
- 'Craspedodon belongs to Iguanodontidae'
- 'Craspedodon lonzeensis belongs to Craspedodon'
- 'Eucercosaurus belongs to Iguanodontidae'
- 'Eucercosaurus tanyspondylus belongs to Eucercosaurus'
- 'Iguanodon belongs to Iguanodontidae'
- 'Iguanodon atherfieldensis belongs to Iguanodon'
- 'Iguanodon bernissartensis belongs to Iguanodon'
- 'Iguanodon dawsoni belongs to Iguanodon'
- 'Iguanodon fittoni belongs to Iguanodon'
- 'Iguanodon hillii is recombined as Craspedodon hillii'
- 'Iguanodon hoggii belongs to Iguanodon'
- 'Iguanodon hollingtoniensis belongs to Iguanodon'
- 'Iguanodon mantelli belongs to Iguanodon'
- 'Iguanodon orientalis belongs to Iguanodon'
- 'Iguanodon ottingeri belongs to Iguanodon'
- 'Iguanodon prestwichii is recombined as Camptosaurus prestwichii'
- 'Iguanodon seelyi belongs to Iguanodon'
- 'Muttaburrasaurus belongs to Iguanodontidae'
- 'Muttaburrasaurus langdoni belongs to Muttaburrasaurus'
- 'Ouranosaurus belongs to Iguanodontidae'
- 'Ouranosaurus nigeriensis belongs to Ouranosaurus'
- 'Probactrosaurus belongs to Iguanodontidae'
- 'Probactrosaurus alashanicus belongs to Probactrosaurus'
- 'Probactrosaurus gobiensis belongs to Probactrosaurus'
- 'Sphenospondylus gracilis is recombined as Iguanodon gracilis'
- 'Syngonosaurus is a subjective synonym of Eucercosaurus'
- 'Vectisaurus belongs to Iguanodontidae'
- 'Vectisaurus valdensis belongs to Vectisaurus'