Opinions from T. Kasuya 1973
- 'Berardius belongs to Ziphiinae'
- 'Cephalorhynchus belongs to Sotaliinae'
- 'Delphinapteridae belongs to Delphinoidea'
- 'Delphinapterinae belongs to Delphinapteridae'
- 'Delphinapterus belongs to Delphinapterinae'
- 'Delphinidae belongs to Delphinoidea'
- 'Delphininae belongs to Delphinidae'
- 'Delphinoidea belongs to Odontoceti'
- 'Delphinus belongs to Delphininae'
- 'Delphinus (Grampus) was reranked as Grampus and belongs to Globicephalinae'
- 'Globicephala belongs to Globicephalinae'
- 'Globiocephalidae was reranked as the subfamily Globicephalinae and belongs to Delphinidae'
- 'Hyperoodon belongs to Ziphiinae'
- 'Inia belongs to Iniinae'
- 'Iniana was reranked as the family Iniidae and belongs to Platanistoidea'
- 'Iniinae belongs to Iniidae'
- 'Kogia belongs to Kogiinae'
- 'Kogiidae belongs to Physeteroidea'
- 'Kogiinae belongs to Kogiidae'
- 'Lagenorhynchus belongs to Delphininae'
- 'Lipotes belongs to Iniinae'
- 'Lissodelphis belongs to Delphininae'
- 'Mesoplodon belongs to Ziphiinae'
- 'Monodon belongs to Monodontinae'
- 'Monodontidae belongs to Delphinoidea'
- 'Monodontinae belongs to Monodontidae'
- 'Neophocaena belongs to Phocoeninae'
- 'Orca (Feresa) was reranked as Feresa and belongs to Globicephalinae'
- 'Orca (Orcaella) was reranked as Orcaella and belongs to Orcaellidae'
- 'Orcellidae was reranked as the subfamily Orcaellinae and belongs to Delphinapteridae'
- 'Orcini was reranked as the subfamily Orcininae and belongs to Delphinidae'
- 'Orcinus belongs to Orcininae'
- 'Peponocephala belongs to Globicephalinae'
- 'Phocaena is corrected as Phocoena and belongs to Phocoeninae'
- 'Phocaenina was reranked as the family Phocoenidae and belongs to Delphinoidea'
- 'Phocoeninae belongs to Phocoenidae'
- 'Phocoenoides belongs to Phocoeninae'
- 'Physeter belongs to Physeterinae'
- 'Physeteridae belongs to Physeteroidea'
- 'Physeterinae belongs to Physeteridae'
- 'Physeteroidea belongs to Odontoceti'
- 'Platanista belongs to Platanistinae'
- 'Platanistina was reranked as the family Platanistidae and belongs to Platanistoidea'
- 'Platanistinae belongs to Platanistidae'
- 'Platanistoidea belongs to Odontoceti'
- 'Pontoporia belongs to Pontoporiinae'
- 'Pontoporiidae belongs to Platanistoidea'
- 'Pontoporiinae belongs to Pontoporiidae'
- 'Pseudorca belongs to Orcininae'
- 'Sotalia belongs to Sotaliinae'
- 'Sotaliinae belongs to Delphinidae'
- 'Sousa belongs to Sotaliinae'
- 'Steno belongs to Delphininae'
- 'Steno (Stenella) was reranked as Stenella and belongs to Delphininae'
- 'Tasmacetus belongs to Ziphiinae'
- 'Tursiops belongs to Delphininae'
- 'Ziphiidae was reranked as the tribe Ziphiina and belongs to Ziphioidea'
- 'Ziphius belongs to Ziphiinae'