Opinions from R. E. Fordyce and C. D. Roberts 2009
- 'Archaeoceti belongs to Cetacea'
- 'Austrosqualodon belongs to Squalodontidae'
- 'Austrosqualodon trirhizodonta belongs to Austrosqualodon'
- 'Balaenoptera belongs to Balaenopteridae'
- 'Balaenopteridae belongs to Mysticeti'
- 'Balanadae is corrected as Balaenidae and belongs to Mysticeti'
- 'Basilosauridae belongs to Archaeoceti'
- 'Basilosaurinae belongs to Basilosauridae'
- 'Dalpiazinidae belongs to Odontoceti'
- 'Delphinidae belongs to Delphinoidea'
- 'Delphinus belongs to Delphinidae'
- 'Delphinus delphis belongs to Delphinus'
- 'Dorudon belongs to Dorudontinae'
- 'Dorudontidae was reranked as the subfamily Dorudontinae and belongs to Basilosauridae'
- 'Eomysticetidae belongs to Mysticeti'
- 'Eurhinodelphidae is corrected as Eurhinodelphinidae and belongs to Odontoceti'
- 'Globicephala belongs to Delphinidae'
- 'Hyperoodon belongs to Ziphiidae'
- 'Kekenodon belongs to Archaeoceti'
- 'Kentriodon belongs to Kentriodontidae'
- 'Kentriodon pernix belongs to Kentriodon'
- 'Kogia belongs to Kogiidae'
- 'Llanocetidae belongs to Mysticeti'
- 'Llanocetus belongs to Llanocetidae'
- 'Lophocephalus parki is recombined as Mauicetus parki'
- 'Mauicetus belongs to Balaenopteridae'
- 'Mauicetus brevicollis is an invalid subgroup of Mysticeti'
- 'Mauicetus lophocephalus is an invalid subgroup of Eomysticetidae'
- 'Mauicetus waitakiensis is an invalid subgroup of Eomysticetidae'
- 'Microcetus hectori is an invalid subgroup of Squalodelphinidae'
- 'Notocetus belongs to Squalodelphinidae'
- 'Orcinus belongs to Delphinidae'
- 'Phocaenopsis belongs to Eurhinodelphinidae'
- 'Phocaenopsis mantelli belongs to Phocaenopsis'
- 'Prosqualodon davidis belongs to Prosqualodon'
- 'Prosqualodon hamiltoni is an invalid subgroup of Squalodontidae'
- 'Prosqualodon marplesi is recombined as Notocetus marplesi'
- 'Pseudorca belongs to Delphinidae'
- 'Scaldicetus belongs to Physeteridae'
- 'Squalodon andrewi is an invalid subgroup of Squalodontidae'
- 'Squalodon gambierensis is an invalid subgroup of Archaeoceti'
- 'Squalodon serratus is an invalid subgroup of Archaeoceti'
- 'Tangaroasaurus belongs to Squalodontidae'
- 'Tangaroasaurus kakanuiensis belongs to Tangaroasaurus'
- 'Waipatia belongs to Waipatiidae'
- 'Waipatia maerewhenua belongs to Waipatia'
- 'Zygorhiza belongs to Dorudontinae'