Opinions from O. Rieppel 1995
- 'Anomosaurus is a subjective synonym of Placodus'
- 'Anomosaurus strunzi is a subjective synonym of Placodus gigas'
- 'Anomosaurus strunzi belongs to Anomosaurus' according to Huene 1905
- 'Placodontia was reranked as a unranked clade and belongs to Sauropterygia'
- 'Placodontidae belongs to Placodontoidea'
- 'Placodontoidea belongs to Placodontia'
- 'Placodus belongs to Placodontidae'
- 'Placodus aethiops belongs to Placodus' according to Meyer 1863
- 'Placodus aethiops [misspelled as Placodus aethiopi] belongs to Placodus' according to Jaekel 1907
- 'Placodus aethiops is a nomen nudum'
- 'Placodus andriani is a nomen dubium'
- 'Placodus angustus belongs to Placodus' according to Meyer 1863
- 'Placodus angustus is a nomen nudum'
- 'Placodus antiquior belongs to Placodus' according to Pinna 1990
- 'Placodus antiquior is a subjective synonym of Placodus gigas'
- 'Placodus bathygnathus is a nomen dubium'
- 'Placodus bombidens belongs to Placodus' according to Owen 1858
- 'Placodus bombidens is a nomen dubium'
- 'Placodus gigas belongs to Placodus'
- 'Placodus gracilis belongs to Placodus' according to Jurcsak 1976
- 'Placodus gracilis is a nomen dubium'
- 'Placodus hypsiceps belongs to Placodus' according to Meyer 1863
- 'Placodus hypsiceps is a subjective synonym of Placodus gigas'
- 'Placodus hypsiceps [misspelled as Placodus hypsicephalus] belongs to Placodus' according to Braun 1863
- 'Placodus impressus belongs to Placodus' according to Braun 1863
- 'Placodus impressus is a nomen dubium'
- 'Placodus pachygnathus is a nomen dubium'
- 'Placodus quinmolaris is a subjective synonym of Placodus gigas'
- 'Placodus quinmolaris belongs to Placodus' according to Braun 1863
- 'Placodus rugosus belongs to Placodus' according to Meyer 1863
- 'Placodus rugosus is a nomen nudum'