Opinions from P. D. Gingerich 2005
- 'Aetiocetidae belongs to Aetiocetoidea'
- 'Aetiocetoidea belongs to Mysticeti'
- 'Agorophiidae belongs to Agorophioidea'
- 'Agorophioidea belongs to Odontoceti'
- 'Albireonidae belongs to Delphinoidea'
- 'Ambulocetidae belongs to Protocetoidea'
- 'Archaeoceti belongs to Cetacea'
- 'Balaenoidea belongs to Mysticeti'
- 'Balaenopteridae belongs to Balaenopteroidea'
- 'Balaenopteroidea belongs to Mysticeti'
- 'Balanadae is corrected as Balaenidae and belongs to Balaenoidea'
- 'Basilosauridae belongs to Basilosauroidea'
- 'Basilosauroidea belongs to Archaeoceti'
- 'Cetotheriinae was reranked as the family Cetotheriidae and belongs to Balaenopteroidea'
- 'Dalpiazinidae belongs to Platanistoidea'
- 'Delphinoidea belongs to Odontoceti'
- 'Eomysticetidae belongs to Eomysticetoidea'
- 'Eomysticetoidea belongs to Mysticeti'
- 'Eoplatanistidae belongs to Eurhinodelphinoidea'
- 'Eschrichtiidae belongs to Eschrichtioidea'
- 'Eschrichtioidea belongs to Mysticeti'
- 'Eurhinodelphidae is corrected as Eurhinodelphinidae and belongs to Eurhinodelphinoidea'
- 'Eurhinodelphoidea is corrected as Eurhinodelphinoidea and belongs to Odontoceti'
- 'Iniana was reranked as the family Iniidae and belongs to Inioidea'
- 'Inioidea belongs to Odontoceti'
- 'Kentriodontidae belongs to Delphinoidea'
- 'Kogiidae belongs to Physeteroidea'
- 'Lipotidae belongs to Lipotoidea'
- 'Lipotoidea belongs to Odontoceti'
- 'Llanocetidae belongs to Aetiocetoidea'
- 'Mammalodontidae belongs to Aetiocetoidea'
- 'Monodontidae belongs to Delphinoidea'
- 'Mysticeti belongs to Cetacea'
- 'Neobalaenidae belongs to Balaenoidea'
- 'Odobenocetopsidae belongs to Delphinoidea'
- 'Odontoceti belongs to Cetacea'
- 'Pakicetinae was reranked as the family Pakicetidae and belongs to Protocetoidea'
- 'Patriocetidae belongs to Agorophioidea'
- 'Phocaenina was reranked as the family Phocoenidae and belongs to Delphinoidea'
- 'Physeteridae belongs to Physeteroidea'
- 'Physeteroidea belongs to Odontoceti'
- 'Platanistina was reranked as the family Platanistidae and belongs to Platanistoidea'
- 'Platanistoidea belongs to Odontoceti'
- 'Pontoporiidae belongs to Inioidea'
- 'Protocetidae belongs to Protocetoidea'
- 'Protocetoidea belongs to Archaeoceti'
- 'Remingtonocetidae belongs to Remingtonocetoidea'
- 'Remingtonocetoidea belongs to Archaeoceti'
- 'Simocetidae belongs to Agorophioidea'
- 'Squalodelphidae is corrected as Squalodelphinidae and belongs to Platanistoidea'
- 'Squalodontidae belongs to Platanistoidea'
- 'Waipatiidae belongs to Platanistoidea'
- 'Ziphiidae belongs to Ziphioidea'
- 'Ziphioidea belongs to Odontoceti'