Opinions from R. Lund 1989
- 'Belantsea belongs to Belantseidae'
- 'Belantsea montana belongs to Belantsea'
- 'Belantseidae belongs to Petalodontiformes'
- 'Climaxodus is a subjective synonym of Janassa'
- 'Ctenopetalus occidentalis belongs to Ctenopetalus' according to St. John and Worthen 1875
- 'Ctenopetalus occidentalis is recombined as Belantsea occidentalis'
- 'Ctenoptychius belongs to Belantseidae'
- 'Ctenoptychius stevensoni belongs to Ctenoptychius' according to St. John and Worthen 1875
- 'Harpacodus clavatus belongs to Harpacodus' according to Davis 1883
- 'Harpacodus compactus belongs to Harpacodus' according to St. John and Worthen 1875
- 'Harpacodus compactus belongs to Harpacodus'
- 'Harpacodus dentatus belongs to Harpacodus' according to Davis 1883
- 'Harpacodus occidentalis belongs to Harpacodus' according to St. John and Worthen 1875
- 'Harpacodus occidentalis belongs to Harpacodus'
- 'Janassa belongs to Janassidae'
- 'Janassa clarki belongs to Janassa'
- 'Janassa wisei belongs to Janassa' according to Traquair 1901
- 'Janassa wisei is recombined as Tanaodus wisei'
- 'Janassidae belongs to Petalodontiformes'
- 'Megactenopetalus belongs to Pristodontidae'
- 'Netsepoye belongs to Belantseidae'
- 'Netsepoye hawesi belongs to Netsepoye'
- 'Peripristidae is a subjective synonym of Pristodontidae'
- 'Peripristis belongs to Pristodontidae'
- 'Petalodontidae belongs to Petalodontiformes'
- 'Petalorhynchus belongs to Pristodontidae'
- 'Petalorhynchus beargulchensis belongs to Petalorhynchus'
- 'Polyrhizodus belongs to Petalodontidae'
- 'Pristodontidae belongs to Petalodontiformes'
- 'Pristodus belongs to Pristodontidae'
- 'Siksika belongs to Pristodontidae'
- 'Siksika ottae belongs to Siksika'