Opinions from M. J. Benton 1993
- 'Acrodelphidae is corrected as Acrodelphinidae and belongs to Odontoceti'
- 'Acrodelphis belongs to Acrodelphinidae'
- 'Aetiocetidae belongs to Mysticeti'
- 'Aetiocetus belongs to Aetiocetidae'
- 'Agorophiidae belongs to Odontoceti'
- 'Agorophius belongs to Agorophiidae'
- 'Agriocetus belongs to Squalodontidae'
- 'Albireo belongs to Albireonidae'
- 'Albireonidae belongs to Odontoceti'
- 'Allodelphis belongs to Platanistidae'
- 'Andrewsiphius belongs to Remingtonocetidae'
- 'Archaeoceti belongs to Cetacea'
- 'Argyrocetus belongs to Rhabdosteidae'
- 'Atocetus belongs to Kentriodontidae'
- 'Australithax belongs to Phocoenidae'
- 'Balaenopteridae belongs to Mysticeti'
- 'Balanadae is corrected as Balaenidae and belongs to Mysticeti'
- 'Basilosauridae belongs to Archaeoceti'
- 'Basilosaurus belongs to Basilosauridae'
- 'Brachydelphis belongs to Pontoporiidae'
- 'Cephalotropis belongs to Cetotheriidae'
- 'Cetotheriinae was reranked as the family Cetotheriidae and belongs to Mysticeti'
- 'Cetotheriopsis belongs to Cetotheriidae'
- 'Champsodelphis [misspelled as Chamsodelphis] belongs to Acrodelphinidae'
- 'Dalpiazina [misspelled as Dalpiazinia] belongs to Dalpiaziniidae'
- 'Dalpiazinidae [misspelled as Dalpiaziniidae] belongs to Odontoceti'
- 'Delphinapterus belongs to Monodontidae'
- 'Delphinapterus (Hemisyntrachelus) was reranked as Hemisyntrachelus and belongs to Hemisyntrachelidae'
- 'Delphinidae belongs to Odontoceti'
- 'Delphinodon belongs to Kentriodontidae'
- 'Diaphorocetus belongs to Physeteridae'
- 'Dorudon belongs to Basilosauridae'
- 'Eoplatanista belongs to Acrodelphinidae'
- 'Eosqualodon belongs to Squalodontidae'
- 'Eschrichtiidae belongs to Mysticeti'
- 'Eurhinodelphis belongs to Rhabdosteidae'
- 'Gandakasia belongs to Protocetidae'
- 'Hemisyntrachelidae belongs to Odontoceti'
- 'Ichthyolestes belongs to Protocetidae'
- 'Indocetus belongs to Protocetidae'
- 'Iniana was reranked as the family Iniidae and belongs to Odontoceti'
- 'Kampholophos [misspelled as Kampholophus] belongs to Kentriodontidae'
- 'Kelloggia belongs to Squalodontidae'
- 'Kentriodon belongs to Kentriodontidae'
- 'Kentriodontidae belongs to Odontoceti'
- 'Leptodelphis belongs to Kentriodontidae'
- 'Liolithax belongs to Kentriodontidae'
- 'Lipotidae belongs to Odontoceti'
- 'Lomacetus belongs to Phocoenidae'
- 'Macrodelphinus belongs to Rhabdosteidae'
- 'Medocinia belongs to Ziphiidae'
- 'Megaptera (Eschrichtius) was reranked as Eschrichtius and belongs to Eschrichtiidae'
- 'Metasqualodon belongs to Squalodontidae'
- 'Microcetus belongs to Squalodontidae'
- 'Microphocaena belongs to Kentriodontidae'
- 'Miokogia belongs to Physeteridae'
- 'Monodontidae belongs to Odontoceti'
- 'Morenocetus belongs to Balaenidae'
- 'Mysticeti belongs to Cetacea'
- 'Notocetus belongs to Ziphiidae'
- 'Odontoceti belongs to Cetacea'
- 'Olenoides [misspelled as Olenoidestranans] belongs to Dorypygidae'
- 'Orcinus belongs to Delphinidae'
- 'Orycterocetus belongs to Physeteridae'
- 'Pakicetus belongs to Protocetidae'
- 'Parasqualodon belongs to Squalodontidae'
- 'Patriocetus belongs to Squalodontidae'
- 'Phocaenina was reranked as the family Phocaenidae and belongs to Odontoceti'
- 'Phocaenopsis belongs to Rhabdosteidae'
- 'Physeter belongs to Physeteridae'
- 'Physeteridae belongs to Odontoceti'
- 'Piscolithax belongs to Phocoenidae'
- 'Platanistina was reranked as the family Platanistidae and belongs to Odontoceti'
- 'Plesiocetus belongs to Balaenopteridae'
- 'Pontoporiidae belongs to Odontoceti'
- 'Prioinia is corrected as Proinia and belongs to Iniidae'
- 'Prolipotes belongs to Lipotidae'
- 'Protocetidae belongs to Archaeoceti'
- 'Protocetus belongs to Protocetidae'
- 'Prozeuglodon belongs to Basilosauridae'
- 'Remingtonocetidae belongs to Odontoceti'
- 'Remingtonocetus belongs to Remingtonocetidae'
- 'Rhabdosteidae belongs to Odontoceti'
- 'Rhegnopsis belongs to Cetotheriidae'
- 'Salumiphocaena belongs to Phocoenidae'
- 'Sarmatodelphis belongs to Kentriodontidae'
- 'Scaldicetus belongs to Physeteridae'
- 'Schizodelphis belongs to Acrodelphinidae'
- 'Squalodelphis belongs to Ziphiidae'
- 'Squalodon belongs to Squalodontidae'
- 'Squalodontidae belongs to Odontoceti'
- 'Tursiops belongs to Delphinidae'
- 'Ziphiidae belongs to Odontoceti'
- 'Ziphiodelphis belongs to Rhabdosteidae'
- 'Zygorhiza belongs to Basilosauridae'