Opinions from J. C. W. Cope 1997
- 'Actinodontoida belongs to Palaeoheterodonta'
- 'Actinodontoidea belongs to Actinodontoida'
- 'Alytodonta belongs to Parallelodontidae'
- 'Alytodonta gibbosa belongs to Alytodonta'
- 'Anomalodesmata belongs to Bivalvia'
- 'Arca subtruncata is recombined as Homilodonta subtruncata'
- 'Arca subtruncata belongs to Arca' according to Portlock 1843
- 'Arcacea is corrected as Arcoidea and belongs to Arcoida'
- 'Arcoida belongs to Neotaxodonta'
- 'Babinka belongs to Babinkidae'
- 'Babinka oelandensis belongs to Babinka' according to Soot-Ryen 1969
- 'Babinka oelandensis belongs to Babinka'
- 'Babinka prima belongs to Babinka' according to Barrande 1881
- 'Babinka prima belongs to Babinka'
- 'Babinkidae belongs to Actinodontoidea'
- 'Cardiolaria belongs to Cardiolariidae'
- 'Cardiolariidae belongs to Nuculoidea'
- 'Ctenodonta filistriata belongs to Ctenodonta' according to Ulrich 1894
- 'Ctenodonta filistriata is recombined as Deceptrix filistriata' according to Pojeta 1978
- 'Ctenodonta filistriata is recombined as Homilodonta filistriata'
- 'Cyrtodonta gibbosa belongs to Cyrtodonta' according to Salter 1910
- 'Cyrtodonta gibbosa is a nomen nudum'
- 'Deceptrix belongs to Cardiolariidae'
- 'Heterodonta belongs to Bivalvia'
- 'Homilodonta belongs to Praenuculidae'
- 'Inaequidens belongs to Cardiolariidae'
- 'Limopsoidea belongs to Arcoida'
- 'Neotaxodonta belongs to Bivalvia'
- 'Nuculacea is corrected as Nuculoidea and belongs to Nuculoida'
- 'Palaeoheterodonta [misspelled as Paleoheterodonta] belongs to Pelecypoda' according to Shoshani 1989
- 'Palaeoheterodonta belongs to Bivalvia'
- 'Palaeotaxodonta belongs to Bivalvia'
- 'Parallelodontidae belongs to Arcoida'
- 'Pteriomorphia belongs to Bivalvia'
- 'Solemyoida belongs to Lipodonta'
- 'Solemyoidea belongs to Solemyoida'