Opinions from D. M. S. Watson 1919
- 'Acanthostomatidae is a subjective synonym of Zatrachydae'
- 'Acheloma belongs to Achelomidae'
- 'Achelomidae belongs to Rachitomi'
- 'Actinodon belongs to Actinodontidae'
- 'Actinodontidae belongs to Rachitomi'
- 'Alegeinosaurus belongs to Aspidosaurinae'
- 'Anaschisma [misspelled as Anaschima] belongs to Metoposauridae'
- 'Aphaneramma belongs to Trematosauridae'
- 'Archegosauridae belongs to Rachitomi'
- 'Archegosaurus belongs to Archegosauridae'
- 'Aspidosauridae was reranked as the subfamily Aspidosaurinae and belongs to Dissorophidae'
- 'Aspidosaurus belongs to Aspidosaurinae'
- 'Batrachosuchus belongs to Brachyopidae'
- 'Bothriceps belongs to Brachyopidae'
- 'Brachyopidae belongs to Stereospondyli'
- 'Brachyops belongs to Brachyopidae'
- 'Broiliellus belongs to Aspidosaurinae'
- 'Cacops belongs to Dissorophinae'
- 'Capitosauridae belongs to Stereospondyli'
- 'Capitosaurus belongs to Capitosauridae'
- 'Chelydosaurus belongs to Actinodontidae'
- 'Cochleosaurus belongs to Rachitomi'
- 'Cyclotosaurus belongs to Capitosauridae'
- 'Dasyceps belongs to Zatrachydae'
- 'Discosaurus belongs to Rachitomi'
- 'Dissorophidae belongs to Rachitomi'
- 'Dissorophinae belongs to Dissorophidae'
- 'Dissorophus belongs to Dissorophinae'
- 'Embolomeri belongs to Labyrinthodontia'
- 'Eryopidae belongs to Rachitomi'
- 'Eryops belongs to Eryopidae'
- 'Laccocephalus belongs to Rhinesuchidae'
- 'Laccocephalus insperatus belongs to Laccocephalus'
- 'Lonchorhynchus belongs to Trematosauridae'
- 'Lydekkerina belongs to Lydekkerinidae'
- 'Lydekkerinidae belongs to Rachitomi'
- 'Lyrocephalus belongs to Trematosauridae'
- 'Mastodonsauridae belongs to Stereospondyli'
- 'Mastodonsaurus belongs to Mastodonsauridae'
- 'Melosaurus belongs to Rachitomi'
- 'Metoposauridae belongs to Stereospondyli'
- 'Metoposaurus belongs to Metoposauridae'
- 'Micropholidae belongs to Rhachitomi'
- 'Micropholis belongs to Micropholidae'
- 'Onchiodon belongs to Eryopidae'
- 'Osteophorus belongs to Actinodontidae'
- 'Parioxys belongs to Eryopidae'
- 'Plagiosaurus belongs to Brachyopidae'
- 'Plagiosternum belongs to Brachyopidae'
- 'Platyhystrix [misspelled as Platyhystryx] belongs to Zatrachydae'
- 'Platyops belongs to Rachitomi'
- 'Platystega belongs to Trematosauridae'
- 'Rhachitomi [misspelled as Rachitomi] belongs to Embolomeri'
- 'Rhinesuchidae belongs to Rachitomi'
- 'Rhinesuchus belongs to Rhinesuchidae'
- 'Sclerocephalus belongs to Actinodontidae'
- 'Sparagmites belongs to Rachitomi'
- 'Stereospondyli was reranked as a unranked clade and belongs to Labyrinthodontia'
- 'Tertrema belongs to Trematosauridae'
- 'Trematops belongs to Trematopsidae'
- 'Trematopsidae belongs to Rachitomi'
- 'Trematosauridae belongs to Stereospondyli'
- 'Trematosaurus belongs to Trematosauridae'
- 'Trematosuchus belongs to Trematosauridae'
- 'Trimerorhachidae [misspelled as Trimerorachidae] belongs to Rachitomi'
- 'Trimerorhachis [misspelled as Trimerorachis] belongs to Trimerorachidae'
- 'Zatracheidae [misspelled as Zatrachydae] belongs to Rachitomi'
- 'Zatrachys belongs to Zatrachydae'
- 'Zygosaurus belongs to Dissorophinae'