Opinions from S. P. Welles and J. Cosgriff 1965
- 'Batrachosaurus is an objective synonym of Mastodonsaurus'
- 'Batrachosaurus jaegeri belongs to Batrachosaurus' according to Fitzinger 1840
- 'Batrachosaurus jaegeri is an objective synonym of Mastodonsaurus jaegeri'
- 'Capitosaurus is a nomen vanum'
- 'Capitosaurus arenaceus is a nomen vanum'
- 'Capitosaurus fronto belongs to Capitosaurus' according to Meyer 1858
- 'Capitosaurus fronto is a subjective synonym of Parotosaurus nasutus'
- 'Capitosaurus helgolandiae is recombined as Parotosaurus helgolandiae'
- 'Capitosaurus nasutus is recombined as Parotosaurus nasutus'
- 'Capitosaurus polaris is a nomen vanum'
- 'Capitosaurus robustus is recombined as Cyclotosaurus robustus'
- 'Capitosaurus stantonensis is recombined as Cyclotosaurus stantonensis'
- 'Cyclotosaurus belongs to Capitosauridae'
- 'Cyclotosaurus mordax belongs to Cyclotosaurus'
- 'Cyclotosaurus papilio is a nomen vanum'
- 'Cyclotosaurus posthumus belongs to Cyclotosaurus'
- 'Cyclotosaurus spitzbergensis is a nomen vanum'
- 'Diadetognathus is a nomen vanum'
- 'Diadetognathus varvicensis is a nomen vanum'
- 'Eupelor is a nomen vanum'
- 'Hercynosaurus is a nomen vanum'
- 'Hercynosaurus carinidens is a nomen vanum'
- 'Kestrosaurus belongs to Capitosauridae'
- 'Kestrosaurus dreyeri belongs to Kestrosaurus'
- 'Labyrinthodon is an objective synonym of Mastodonsaurus'
- 'Labyrinthodon bucklandi is a nomen dubium'
- 'Labyrinthodon fuerstenbergianus is a nomen dubium'
- 'Labyrinthodon jaegeri is an objective synonym of Mastodonsaurus jaegeri'
- 'Labyrinthodon laniarius belongs to Labyrinthodon' according to Owen 1842
- 'Labyrinthodon laniarius is a nomen vanum'
- 'Labyrinthodon lavisi is a nomen vanum'
- 'Labyrinthodon leptognathus is a nomen vanum'
- 'Labyrinthodon ocella is a nomen dubium'
- 'Labyrinthodon pachygnathus is a nomen vanum'
- 'Labyrinthodon salamandroides is an objective synonym of Mastodonsaurus jaegeri'
- 'Labyrinthodon ventricosus is a nomen vanum'
- 'Mastodonsaurus is a nomen vanum'
- 'Mastodonsaurus cappelensis belongs to Mastodonsaurus'
- 'Mastodonsaurus cyclotis belongs to Mastodonsaurus' according to Quenstadt 1850
- 'Mastodonsaurus cyclotis is an objective synonym of Cyclotosaurus robustus'
- 'Mastodonsaurus durus is a nomen vanum'
- 'Mastodonsaurus jaegeri is a nomen vanum'
- 'Mastodonsaurus meyeri is a nomen vanum'
- 'Mastodonsaurus robustus belongs to Mastodonsaurus' according to Quenstadt 1850
- 'Mastodonsaurus silesiacus is a nomen vanum'
- 'Mastodonsaurus vaslenensis is a nomen vanum'
- 'Odontosaurus is a nomen vanum'
- 'Odontosaurus voltzii is a nomen vanum'
- 'Pachygonia is a nomen vanum'
- 'Pachygonia incurvata is a nomen vanum'
- 'Parotosaurus belongs to Capitosauridae'
- 'Salamandroides is a nomen vanum'
- 'Salamandroides giganteus is a nomen vanum'
- 'Salamandroides jaegeri belongs to Salamandroides' according to Alberti 1834
- 'Salamandroides jaegeri is an objective synonym of Salamandroides giganteus'
- 'Xestorrhytias is a nomen vanum'
- 'Xestorrhytias perrini is a nomen vanum'