Opinions from F. C. Whitmore and J. A. Kaltenbach 2008
- 'Aprixokogia belongs to Kogiinae'
- 'Aprixokogia kelloggi belongs to Aprixokogia'
- 'Araeodelphis belongs to Platanistidae'
- 'Araeodelphis natator belongs to Araeodelphis'
- 'Atocetus belongs to Pithanodelphininae'
- 'Balaena belongs to Balaenidae'
- 'Balaenoptera belongs to Balaenopteridae'
- 'Balaenoptera acutorostrata belongs to Balaenoptera'
- 'Balaenoptera borealina belongs to Balaenoptera'
- 'Balaenopteridae belongs to Mysticeti'
- 'Balaenotus is a nomen nudum'
- 'Balaenula belongs to Balaenidae'
- 'Balanadae is corrected as Balaenidae and belongs to Mysticeti'
- 'Cetotheriinae was reranked as the family Cetotheriidae and belongs to Mysticeti'
- 'Cetotheriinae belongs to Cetotheriidae'
- 'Champsodelphis belongs to Odontoceti'
- 'Choneziphius belongs to Ziphiidae'
- 'Choneziphius trachops belongs to Choneziphius'
- 'Delphinapterinae belongs to Monodontidae'
- 'Delphinapterus belongs to Delphinapterinae'
- 'Delphinapterus gabbii is recombined as Tretosphys gabbii'
- 'Delphinidae belongs to Delphinoidea'
- 'Delphinodon belongs to Kentriodontinae'
- 'Delphinodon dividum belongs to Delphinodon'
- 'Delphinoidea belongs to Odontoceti'
- 'Delphinus belongs to Delphinidae'
- 'Eschrichtiidae belongs to Mysticeti'
- 'Eurhinodelphidae is corrected as Eurhinodelphinidae and belongs to Eurhinodelphinoidea'
- 'Eurhinodelphoidea is corrected as Eurhinodelphinoidea and belongs to Odontoceti'
- 'Globicephala belongs to Delphinidae'
- 'Gricetoides belongs to Eschrichtiidae'
- 'Gricetoides aurorae belongs to Gricetoides'
- 'Herpetocetinae belongs to Cetotheriidae'
- 'Herpetocetus belongs to Herpetocetinae'
- 'Herpetocetus transatlanticus belongs to Herpetocetus'
- 'Hyperoodon gervaisii belongs to Hyperoodon' according to Duvernoy 1851
- 'Hyperoodon gervaisii is a subjective synonym of Ziphius cavirostris'
- 'Hyperoodon gervaisii is recombined as Ziphius gervaisii' according to Fischer 1867
- 'Hyperoodon semijunctus is a subjective synonym of Ziphius cavirostris'
- 'Hyperoodon semijunctus is recombined as Ziphius semijunctus' according to F. W. True 1885
- 'Kentriodon belongs to Kentriodontinae'
- 'Kentriodon schneideri belongs to Kentriodon'
- 'Kentriodontidae belongs to Delphinoidea'
- 'Kentriodontinae belongs to Kentriodontidae'
- 'Kogiidae belongs to Physeteroidea'
- 'Kogiinae belongs to Kogiidae'
- 'Lagenorhynchus belongs to Delphinidae'
- 'Lagenorhynchus harmatuki belongs to Lagenorhynchus'
- 'Lophocetinae belongs to Kentriodontidae'
- 'Lophocetus belongs to Lophocetinae'
- 'Lophocetus pappus belongs to Lophocetus'
- 'Megaptera belongs to Balaenopteridae'
- 'Mesoplodon belongs to Ziphiidae'
- 'Monodontidae belongs to Delphinoidea'
- 'Nannolithax belongs to Odontoceti'
- 'Ninoziphius belongs to Ziphiidae'
- 'Ninoziphius platyrostris belongs to Ninoziphius'
- 'Phocageneus belongs to Squalodelphinidae'
- 'Phocageneus venustus belongs to Phocageneus'
- 'Physeteridae belongs to Physeteroidea'
- 'Physeterinae belongs to Physeteridae'
- 'Physeteroidea belongs to Odontoceti'
- 'Pithanodelphinae is corrected as Pithanodelphininae and belongs to Kentriodontidae'
- 'Platanistina was reranked as the family Platanistidae and belongs to Platanistoidea'
- 'Platanistoidea belongs to Odontoceti'
- 'Pomatodelphininae belongs to Platanistidae'
- 'Pomatodelphis belongs to Pomatodelphininae'
- 'Pontoporia belongs to Pontoporiidae'
- 'Pontoporiidae belongs to Odontoceti'
- 'Probalaena is a nomen nudum'
- 'Pseudorca belongs to Delphinidae'
- 'Squalodelphidae is corrected as Squalodelphinidae and belongs to Platanistoidea'
- 'Squalodon calvertensis belongs to Squalodon'
- 'Delphinodon mento is an invalid subgroup of Odontoceti'
- 'Squalodon whitmorei belongs to Squalodon'
- 'Squalodontidae belongs to Platanistoidea'
- 'Stenella kabatensis belongs to Stenella'
- 'Stenella rayi belongs to Stenella'
- 'Steno (Stenella) was reranked as Stenella and belongs to Delphinidae'
- 'Tretosphys is a nomen dubium'
- 'Tursiops belongs to Delphinidae'
- 'Xiphiacetus belongs to Eurhinodelphinidae'
- 'Ziphiidae belongs to Ziphioidea'
- 'Ziphioidea belongs to Odontoceti'
- 'Ziphius belongs to Ziphiidae'
- 'Ziphius cavirostris belongs to Ziphius'
- 'Ziphius grebnitzkii belongs to Ziphius' according to Stejneger 1883
- 'Ziphius grebnitzkii is a subjective synonym of Ziphius cavirostris'
- 'Ziphius longirostris is recombined as Mesoplodon longirostris'