Opinions from M. Weber 1928
- 'Balaena belongs to Balaenidae'
- 'Balaenoptera belongs to Balaenopteridae'
- 'Balaenopteridae belongs to Mystacoceti'
- 'Balanadae is corrected as Balaenidae and belongs to Mystacoceti'
- 'Berardius belongs to Ziphiinae'
- 'Cephalorhynchus belongs to Delphininae'
- 'Cystophorina is corrected as Cystophorinae and belongs to Phocidae'
- 'Delphinapteridae belongs to Odontoceti'
- 'Delphinapterus belongs to Delphinapteridae'
- 'Delphinidae belongs to Odontoceti'
- 'Delphininae belongs to Delphinidae'
- 'Delphinus belongs to Delphininae'
- 'Delphinus (Grampus) was reranked as Grampus and belongs to Delphininae'
- 'Globicephala belongs to Delphininae'
- 'Halicoridae belongs to Sirenia'
- 'Hydrodamalidae is a subjective synonym of Rhytinidae'
- 'Hyperoodon belongs to Ziphiinae'
- 'Iniinae belongs to Platanistidae'
- 'Kogia belongs to Physeterinae'
- 'Lagenorhynchus belongs to Delphininae'
- 'Lobodontini was reranked as the subfamily Lobodontinae and belongs to Phocidae'
- 'Manatidae belongs to Sirenia'
- 'Megaptera belongs to Balaenopteridae'
- 'Mesoplodon belongs to Ziphiinae'
- 'Monachinae belongs to Phocidae'
- 'Monodon belongs to Delphinapteridae'
- 'Mystacoceti belongs to Cetacea'
- 'Neobalaena belongs to Balaenidae'
- 'Neophocaena belongs to Phocaeninae'
- 'Odobaenidae is corrected as Odobenidae and belongs to Pinnipedia'
- 'Odontoceti belongs to Cetacea'
- 'Orca (Feresa) [misspelled as Feresia] belongs to Delphininae'
- 'Orca (Orcaella) was reranked as Orcaella and belongs to Delphininae'
- 'Orcinus belongs to Delphininae'
- 'Otariina was reranked as the family Otariidae and belongs to Pinnipedia'
- 'Phocadae is corrected as Phocidae and belongs to Pinnipedia'
- 'Phocaena belongs to Phocaeninae'
- 'Phocinae belongs to Phocidae'
- 'Phocoeninae belongs to Delphinidae'
- 'Physeter belongs to Physeterinae'
- 'Physeteridae belongs to Odontoceti'
- 'Physeterinae belongs to Physeteridae'
- 'Pinnipedia was reranked as a suborder and belongs to Carnivora'
- 'Platanista belongs to Platanistinae'
- 'Platanistina was reranked as the family Platanistidae and belongs to Odontoceti'
- 'Platanistinae belongs to Platanistidae'
- 'Prodelphinus belongs to Delphininae'
- 'Pseudorca belongs to Delphininae'
- 'Rhachianectes belongs to Rhachianectidae'
- 'Rhachianectidae belongs to Mystacoceti'
- 'Rhytinidae belongs to Sirenia'
- 'Sagmatias belongs to Delphininae'
- 'Sotalia belongs to Delphininae'
- 'Steno belongs to Delphininae'
- 'Trichechidae is a subjective synonym of Odobenidae'
- 'Tursio belongs to Delphininae'
- 'Tursiops belongs to Delphininae'
- 'Ziphiinae belongs to Physeteridae'
- 'Ziphius belongs to Ziphiinae'