Opinions from R. E. Fordyce et al. 1995
- 'Aetiocetidae belongs to Mysticeti'
- 'Agorophiidae belongs to Odontoceti'
- 'Albireonidae belongs to Delphinoidea'
- 'Archaeoceti belongs to Cetacea'
- 'Balaenopteridae belongs to Mysticeti'
- 'Balaenopterinae belongs to Balaenopteridae'
- 'Balanadae is corrected as Balaenidae and belongs to Mysticeti'
- 'Basilosauridae belongs to Archaeoceti'
- 'Basilosaurinae belongs to Basilosauridae'
- 'Cetotheriinae was reranked as the family Cetotheriidae and belongs to Mysticeti'
- 'Dalpiazinidae belongs to Platanistoidea'
- 'Delphinapterinae belongs to Monodontidae'
- 'Delphinidae belongs to Delphinoidea'
- 'Delphininae belongs to Delphinidae'
- 'Delphinoidea belongs to Odontoceti'
- 'Dorudontidae was reranked as the subfamily Dorudontinae and belongs to Basilosauridae'
- 'Eoplatanistidae belongs to Eurhinodelphinoidea'
- 'Eschrichtiidae belongs to Mysticeti'
- 'Eurhinodelphidae belongs to Eurhinodelphinoidea'
- 'Eurhinodelphoidea belongs to Odontoceti'
- 'Globiocephalidae was reranked as the subfamily Globicephalinae and belongs to Delphinidae'
- 'Hemisyntrachelidae is a subjective synonym of Delphinidae'
- 'Holodontidae is a subjective synonym of Delphinidae'
- 'Hoplocetinae belongs to Physeteridae'
- 'Hyperoodontinae belongs to Ziphiidae'
- 'Iniana was reranked as the family Iniidae and belongs to Odontoceti'
- 'Kampholophinae belongs to Kentriodontidae'
- 'Kekenodontinae was reranked as the family Kekenodontidae and belongs to Mysticeti'
- 'Kentriodontidae belongs to Delphinoidea'
- 'Kentriodontinae belongs to Kentriodontidae'
- 'Kogiidae belongs to Physeteroidea'
- 'Lipotinae belongs to Pontoporiidae'
- 'Llanocetidae belongs to Mysticeti'
- 'Lophocetinae belongs to Kentriodontidae'
- 'Mammalodontidae belongs to Mysticeti'
- 'Megapterinae belongs to Balaenopteridae'
- 'Monodontidae belongs to Delphinoidea'
- 'Monodontinae belongs to Monodontidae'
- 'Mysticeti belongs to Cetacea'
- 'Neobalaenidae belongs to Mysticeti'
- 'Odobenocetopsidae belongs to Delphinoidea'
- 'Odontoceti belongs to Cetacea'
- 'Orcellidae was reranked as the subfamily Orcaellinae and belongs to Monodontidae'
- 'Pakicetinae belongs to Protocetidae'
- 'Parapontoporiinae belongs to Pontoporiidae'
- 'Patriocetidae was reranked as the subfamily Patriocetinae and belongs to Squalodontidae'
- 'Phocaenina was reranked as the family Phocoenidae and belongs to Delphinoidea'
- 'Phocoeninae belongs to Phocoenidae'
- 'Phocoenoidinae belongs to Phocoenidae'
- 'Physeteridae belongs to Physeteroidea'
- 'Physeterinae belongs to Physeteridae'
- 'Physeteroidea belongs to Odontoceti'
- 'Platanistina was reranked as the family Platanistidae and belongs to Platanistoidea'
- 'Platanistoidea belongs to Odontoceti'
- 'Pontoporiidae belongs to Odontoceti'
- 'Pontoporiinae belongs to Pontoporiidae'
- 'Protocetidae belongs to Archaeoceti'
- 'Protocetinae belongs to Protocetidae'
- 'Remingtonocetidae belongs to Archaeoceti'
- 'Squalodelphidae belongs to Platanistoidea'
- 'Squalodontidae belongs to Platanistoidea'
- 'Squalodontinae belongs to Squalodontidae'
- 'Stenidae was reranked as the subfamily Steninae and belongs to Delphinidae'
- 'Waipatiidae belongs to Platanistoidea'
- 'Ziphiidae was reranked as the tribe Ziphiina and belongs to Ziphioidea'
- 'Ziphioidea belongs to Odontoceti'