Opinions from E. C. Case 1907
- 'Archaeobelus belongs to Pelycosauria'
- 'Archaeobelus vellicatus belongs to Archaeobelus'
- 'Clepsydropidae belongs to Pelycosauria'
- 'Clepsydropinae belongs to Clepsydropidae'
- 'Clepsydrops belongs to Clepsydropinae'
- 'Clepsydrops collettii belongs to Clepsydrops'
- 'Clepsydrops leptocephalus is a subjective synonym of Theropleura retroversa'
- 'Clepsydrops limbatus belongs to Clepsydrops'
- 'Clepsydrops macrospondylus is recombined as Dimetrodon macrospondylus'
- 'Clepsydrops natalis belongs to Clepsydrops'
- 'Clepsydrops pedunculatus belongs to Clepsydrops'
- 'Clepsydrops vinslovii belongs to Clepsydrops'
- 'Ctenosaurus belongs to Clepsydropinae'
- 'Dimetrodon belongs to Clepsydropinae'
- 'Dimetrodon cruciger is recombined as Naosaurus cruciger'
- 'Dimetrodon gigashomogenes belongs to Dimetrodon'
- 'Dimetrodon incisivus belongs to Dimetrodon'
- 'Dimetrodon navajovicus belongs to Dimetrodon'
- 'Dimetrodon platycentrus belongs to Dimetrodon'
- 'Dimetrodon rectiformis belongs to Dimetrodon'
- 'Dimetrodon semiradicatus belongs to Dimetrodon'
- 'Edaphosauridae belongs to Pelycosauria'
- 'Edaphosaurus belongs to Edaphosauridae'
- 'Edaphosaurus microdus is recombined as Naosaurus microdus'
- 'Edaphosaurus pogonias belongs to Edaphosaurus'
- 'Elcabrosaurus belongs to Poliosauridae'
- 'Elcabrosaurus baldwini belongs to Elcabrosaurus'
- 'Embolophorus dollovianus is recombined as Dimetrodon dollovianus'
- 'Geosaurus belongs to Naosaurinae'
- 'Geosaurus cynodus belongs to Geosaurus' according to Gervais 1869
- 'Geosaurus cynodus belongs to Geosaurus'
- 'Naosaurinae belongs to Clepsydropidae'
- 'Naosaurus belongs to Naosaurinae'
- 'Pelycosauria belongs to Rhynchocephalia'
- 'Pleuristion belongs to Pelycosauria'
- 'Pleuristion brachycoelous belongs to Pleuristion'
- 'Poliosauridae belongs to Pelycosauria'
- 'Poliosaurus belongs to Poliosauridae'
- 'Sphenacodon belongs to Naosaurinae'
- 'Sphenacodon ferox belongs to Sphenacodon'
- 'Theropleura belongs to Poliosauridae'
- 'Theropleura grandis belongs to Theropleura'
- 'Theropleura obtusidens is recombined as Dimetrodon obtusidens'
- 'Theropleura retroversa belongs to Theropleura'
- 'Theropleura triangulata is a subjective synonym of Theropleura retroversa'
- 'Theropleura uniformis is recombined as Poliosaurus uniformis'
- 'Varanosaurus belongs to Poliosauridae'
- 'Varanosaurus acutirostris belongs to Varanosaurus'