Opinions from J. H. Geisler and A. E. Sanders 2003
- 'Aetiocetidae belongs to Aetiocetoidea'
- 'Aetiocetinae belongs to Aetiocetidae'
- 'Aetiocetoidea belongs to Mysticeti'
- 'Aetiocetus belongs to Aetiocetinae'
- 'Agorophiidae belongs to Odontoceti'
- 'Agorophius belongs to Agorophiidae'
- 'Agriocetus belongs to Odontoceti'
- 'Ambulocetidae belongs to Archaeoceti'
- 'Ambulocetus belongs to Ambulocetidae'
- 'Archaeoceti belongs to Cetacea'
- 'Archaeodelphis belongs to Odontoceti'
- 'Argyrocetus belongs to Platanistoidea'
- 'Artiocetus belongs to Protocetidae'
- 'Atropatenocetus belongs to Odontoceti'
- 'Aulophyseter belongs to Physeteridae'
- 'Autoceta was reranked as a order and belongs to Cetacea'
- 'Balaena belongs to Balaenidae'
- 'Balaenodon belongs to Physeteridae'
- 'Balaenoidea belongs to Balaenomorpha'
- 'Balaenomorpha belongs to Chaeomysticeti'
- 'Balaenoptera belongs to Balaenopteridae'
- 'Balaenopteridae belongs to Balaenopteroidea'
- 'Balaenopteroidea belongs to Balaenomorpha'
- 'Balanadae is corrected as Balaenidae and belongs to Balaenoidea'
- 'Basilosauridae belongs to Archaeoceti'
- 'Basilosaurus belongs to Basilosauridae'
- 'Berardius belongs to Ziphiidae'
- 'Brachydelphis belongs to Platanistoidea'
- 'Caperea belongs to Neobalaenidae'
- 'Cetacea was reranked as a unranked clade and belongs to Cetartiodactyla'
- 'Cetotheriinae was reranked as the family Cetotheriidae and belongs to Balaenomorpha'
- 'Cetotheriopsinae was reranked as the family Cetotheriopsidae and belongs to Eomysticetoidea'
- 'Cetotheriopsis belongs to Cetotheriopsidae'
- 'Cetotherium belongs to Cetotheriidae'
- 'Chaeomysticeti belongs to Mysticeti'
- 'Chonecetinae belongs to Aetiocetidae'
- 'Chonecetus belongs to Chonecetinae'
- 'Choneziphius belongs to Ziphiidae'
- 'Chrysocetus belongs to Basilosauridae'
- 'Cryptomanis belongs to Ziphiidae'
- 'Dalanistes belongs to Remingtonocetidae'
- 'Delphinapterus belongs to Monodontidae'
- 'Delphinidae belongs to Odontoceti'
- 'Diochotichus belongs to Ziphiidae'
- 'Diorocetus belongs to Cetotheriidae'
- 'Dorudon belongs to Basilosauridae'
- 'Eomysticetidae belongs to Eomysticetoidea'
- 'Eomysticetoidea belongs to Chaeomysticeti'
- 'Eomysticetus belongs to Eomysticetidae'
- 'Eosqualodon belongs to Odontoceti'
- 'Eschrichtiidae belongs to Balaenopteroidea'
- 'Eurhinodelphis belongs to Platanistoidea'
- 'Ferecetotherium belongs to Physeteridae'
- 'Gaviacetus belongs to Protocetidae'
- 'Georgiacetus belongs to Protocetidae'
- 'Herpetocetus belongs to Cetotheriidae'
- 'Ichthyolestes belongs to Pakicetidae'
- 'Inia belongs to Iniidae'
- 'Iniana was reranked as the family Iniidae and belongs to Platanistoidea'
- 'Ischyrorhynchus belongs to Iniidae'
- 'Kelloggia belongs to Squalodontidae'
- 'Kentriodon belongs to Kentriodontidae'
- 'Kentriodontidae belongs to Odontoceti'
- 'Kogia belongs to Physeteridae'
- 'Lipotes belongs to Lipotidae'
- 'Lipotidae belongs to Platanistoidea'
- 'Llanocetidae belongs to Aetiocetoidea'
- 'Llanocetus belongs to Llanocetidae'
- 'Mammalodon belongs to Mammalodontidae'
- 'Mammalodontidae belongs to Aetiocetoidea'
- 'Mauicetus belongs to Chaeomysticeti'
- 'Medocinia belongs to Squalodelphinidae'
- 'Megaptera belongs to Balaenopteridae'
- 'Megaptera (Eschrichtius) was reranked as Eschrichtius and belongs to Eschrichtiidae'
- 'Mesoplodon belongs to Ziphiidae'
- 'Microcetus belongs to Odontoceti'
- 'Micromysticetus belongs to Cetotheriopsidae'
- 'Microzeuglodon belongs to Odontoceti'
- 'Mioziphius belongs to Ziphiidae'
- 'Mirocetus belongs to Odontoceti'
- 'Monodon belongs to Monodontidae'
- 'Monodontidae belongs to Odontoceti'
- 'Mysticeti belongs to Autoceta'
- 'Neobalaenidae belongs to Balaenoidea'
- 'Neosqualodon belongs to Squalodontidae'
- 'Notocetus belongs to Squalodelphinidae'
- 'Odontoceti belongs to Autoceta'
- 'Oligodelphis belongs to Odontoceti'
- 'Orycterocetus belongs to Physeteridae'
- 'Pakicetinae was reranked as the family Pakicetidae and belongs to Archaeoceti'
- 'Pakicetus belongs to Pakicetidae'
- 'Parabalaenoptera belongs to Balaenopteridae'
- 'Parapontoporia belongs to Platanistoidea'
- 'Parietobalaena belongs to Cetotheriidae'
- 'Patriocetus belongs to Odontoceti'
- 'Pelocetus belongs to Cetotheriidae'
- 'Phocaena is corrected as Phocoena and belongs to Phocoenidae'
- 'Phocaenina was reranked as the family Phocoenidae and belongs to Odontoceti'
- 'Phocageneus belongs to Squalodelphinidae'
- 'Physeter belongs to Physeteridae'
- 'Physeteridae belongs to Physeteroidea'
- 'Physeteroidea belongs to Odontoceti'
- 'Platanista belongs to Platanistidae'
- 'Platanistina was reranked as the family Platanistidae and belongs to Platanistoidea'
- 'Platanistoidea belongs to Odontoceti'
- 'Pontoporia belongs to Pontoporiidae'
- 'Pontoporiidae belongs to Platanistoidea'
- 'Prosqualodon belongs to Squalodontidae'
- 'Protocetidae belongs to Archaeoceti'
- 'Protocetus belongs to Protocetidae'
- 'Remingtonocetidae belongs to Archaeoceti'
- 'Remingtonocetus belongs to Remingtonocetidae'
- 'Rodhocetus belongs to Protocetidae'
- 'Sachalinocetus belongs to Odontoceti'
- 'Squalodelphidae is corrected as Squalodelphinidae and belongs to Odontoceti'
- 'Squalodelphis belongs to Squalodelphinidae'
- 'Squalodon belongs to Squalodontidae'
- 'Squalodontidae belongs to Odontoceti'
- 'Sulakocetus belongs to Odontoceti'
- 'Tasmacetus belongs to Ziphiidae'
- 'Tursiops belongs to Delphinidae'
- 'Waipatia belongs to Waipatiidae'
- 'Waipatiidae belongs to Odontoceti'
- 'Xenorophus belongs to Odontoceti'
- 'Zarhachis belongs to Platanistidae'
- 'Ziphiidae was reranked as the tribe Ziphiina and belongs to Physeteroidea'
- 'Ziphius belongs to Ziphiidae'
- 'Zygorhiza belongs to Basilosauridae'