Opinions from A. B. Heckert 2004
- 'Adelobasileus belongs to Mammalia'
- 'Adelobasileus cromptoni belongs to Adelobasileus'
- 'Arganodus belongs to Ceratodontidae'
- 'Ceratodontidae belongs to Dipnoi'
- 'Coelacanthidae belongs to Coelacanthiformes'
- 'Coelacanthiformes belongs to Sarcopterygii'
- 'Crosbysaurus belongs to Ornithischia'
- 'Crosbysaurus harrisae belongs to Crosbysaurus'
- 'Diplolonchidion belongs to Lonchidiidae'
- 'Diplolonchidion murryi belongs to Diplolonchidion'
- 'Dipnoi belongs to Sarcopterygii'
- 'Gerdalia belongs to Ostracoda'
- 'Halecostomi belongs to Actinopterygii'
- 'Hybodontes is corrected as Hybodontidae and belongs to Hybodontoidea'
- 'Hybodontoidea belongs to Euselachii'
- 'Lonchidiidae belongs to Hybodontoidea'
- 'Lonchidion belongs to Lonchidiidae'
- 'Palaeoniscidae belongs to Palaeonisciformes'
- 'Palaeonisciformes belongs to Actinopterygii'
- 'Paleollanosaurus belongs to Sphenodontidae'
- 'Paleollanosaurus fraseri belongs to Paleollanosaurus'
- 'Pekinosaurus belongs to Ornithischia'
- 'Pekinosaurus olseni belongs to Pekinosaurus'
- 'Planocephalosaurus belongs to Sphenodontidae'
- 'Planocephalosaurus lucasi belongs to Planocephalosaurus'
- 'Protecovasaurus belongs to Ornithischia'
- 'Protecovasaurus lucasi belongs to Protecovasaurus'
- 'Redfieldiformes belongs to Actinopterygii'
- 'Redfieldiidae belongs to Redfieldiformes'
- 'Redfieldius belongs to Redfieldiidae'
- 'Semionotidae belongs to Semionotiformes'
- 'Semionotiformes belongs to Halecostomi'
- 'Tecovasaurus belongs to Ornithischia'
- 'Tecovasaurus murryi belongs to Tecovasaurus'
- 'Xenacanthidae belongs to Xenacanthiformes'
- 'Xenacanthiformes belongs to Elasmobranchii'
- 'Xenacanthus belongs to Xenacanthidae'