Opinions from R. E. Fordyce and C. de Muizon 2001
- 'Acrodelphis is a subjective synonym of Champsodelphis'
- 'Champsodelphis krahuletzi is a nomen dubium'
- 'Champsodelphis macrospondylus is a nomen dubium'
- 'Aetiocetidae belongs to Mysticeti'
- 'Agabelus is a nomen dubium'
- 'Agorophiidae belongs to Odontoceti'
- 'Agorophius belongs to Agorophiidae'
- 'Agriocetus is a nomen dubium'
- 'Agriocetus austriacus belongs to Agriocetus' according to O. Abel 1913
- 'Albireo belongs to Albireonidae'
- 'Albireonidae belongs to Delphinoidea'
- 'Allodelphis belongs to Platanistoidea'
- 'Ambulocetidae belongs to Archaeoceti'
- 'Anoplonassa belongs to Ziphiidae'
- 'Archaeoceti belongs to Cetacea'
- 'Archaeodelphis belongs to Odontoceti'
- 'Argyrocetus belongs to Eurhinodelphinidae'
- 'Astadelphis belongs to Stenoninae'
- 'Atocetus belongs to Pithanodelphinae'
- 'Atropatenocetus is a nomen dubium'
- 'Aulophyseter belongs to Hoplocetinae'
- 'Australithax belongs to Phocoeninae'
- 'Australophocaena is a subjective synonym of Phocoena'
- 'Austrosqualodon is a nomen dubium'
- 'Austrosqualodon trirhizodonta is a nomen dubium'
- 'Autoceta is a subjective synonym of Neoceti'
- 'Balaenodon is a nomen dubium'
- 'Balaenopteridae belongs to Mysticeti'
- 'Balanadae is corrected as Balaenidae and belongs to Mysticeti'
- 'Basilosauridae belongs to Archaeoceti'
- 'Basilosaurinae belongs to Basilosauridae'
- 'Belemnoziphius is a nomen dubium'
- 'Belonodelphis belongs to Kentriodontinae'
- 'Belosphys is a nomen dubium'
- 'Berardiopsis is a nomen dubium'
- 'Berardius belongs to Ziphiinae'
- 'Brachydelphinae belongs to Pontoporiidae'
- 'Brachydelphis belongs to Brachydelphinae'
- 'Cephalorhynchus belongs to Lissodelphinae'
- 'Cetophis is a nomen dubium'
- 'Cetotheriinae was reranked as the family Cetotheriidae and belongs to Mysticeti'
- 'Champsodelphis is a nomen dubium'
- 'Champsodelphis acutus is a nomen dubium'
- 'Champsodelphis denticulatus is a nomen dubium'
- 'Champsodelphis dubius is a nomen dubium'
- 'Champsodelphis italicus is a nomen dubium'
- 'Champsodelphis karreri is a nomen dubium'
- 'Champsodelphis letochae is a nomen dubium'
- 'Choneziphius belongs to Ziphiinae'
- 'Colophonodon is a nomen dubium'
- 'Dalpiazina belongs to Dalpiazinidae'
- 'Dalpiazinidae belongs to Platanistoidea'
- 'Delphinapterinae belongs to Monodontidae'
- 'Delphinapterus belongs to Delphinapterinae'
- 'Delphinapterus (Hemisyntrachelus) was reranked as Hemisyntrachelus and belongs to Delphininae'
- 'Delphinapterus lacertosus is a nomen nudum'
- 'Delphinavus belongs to Delphinoidea'
- 'Delphinida belongs to Odontoceti'
- 'Delphinidae belongs to Delphinoidea'
- 'Delphininae belongs to Delphinidae'
- 'Delphinodon belongs to Kentriodontinae'
- 'Delphinoidea belongs to Delphinida'
- 'Delphinopsis is a nomen dubium'
- 'Delphinopsis freyeri is a nomen dubium'
- 'Delphinus belongs to Delphininae'
- 'Delphinus (Grampus) was reranked as Grampus and belongs to Globicephalinae'
- 'Champsodelphis bessarabicus is a nomen dubium'
- 'Stereodelphis brevidens is a nomen dubium'
- 'Champsodelphis lophogenius is a nomen dubium'
- 'Denebola belongs to Delphinapterinae'
- 'Diaphorocetus belongs to Hoplocetinae'
- 'Dorudontidae belongs to Basilosauridae'
- 'Eboroziphius is a nomen dubium'
- 'Eoplatanista belongs to Eoplatanistidae'
- 'Eosqualodon belongs to Squalodontidae'
- 'Eschrichtiidae belongs to Mysticeti'
- 'Eurhinodelphidae is corrected as Eurhinodelphinidae and belongs to Eurhinodelphinoidea'
- 'Eurhinodelphinida belongs to Odontoceti'
- 'Eurhinodelphis belongs to Eurhinodelphinidae'
- 'Eurhinodelphoidea is corrected as Eurhinodelphinoidea and belongs to Eurhinodelphinida'
- 'Ferecetotherium belongs to Physeteridae'
- 'Georgiacetus belongs to Basilosauridae'
- 'Globicephala belongs to Globicephalinae'
- 'Globiocephalidae was reranked as the subfamily Globicephalinae and belongs to Delphinidae'
- 'Goniodelphis belongs to Iniidae'
- 'Graphiodon is a nomen dubium'
- 'Hadrodelphis belongs to Lophocetinae'
- 'Helvicetus is a nomen dubium'
- 'Hesperocetus is a nomen dubium'
- 'Hesperoinia is a nomen dubium'
- 'Hesperoinia dalpiazi is a nomen dubium'
- 'Heterodelphis belongs to Delphinida'
- 'Homaeocetus is a nomen dubium'
- 'Homocetus villersii is a nomen dubium'
- 'Hoplocetinae belongs to Physeteridae'
- 'Hoplocetus is a nomen dubium'
- 'Hyperoodon belongs to Hyperoodontinae'
- 'Hyperoodontinae belongs to Ziphiidae'
- 'Idiophyseter belongs to Physeterinae'
- 'Idiorophus belongs to Hoplocetinae'
- 'Imerodelphis is a nomen dubium'
- 'Incacetus belongs to Kentriodontinae'
- 'Indopacetus belongs to Hyperoodontinae'
- 'Inia belongs to Iniidae'
- 'Iniana was reranked as the family Iniidae and belongs to Inioidea'
- 'Inioidea belongs to Delphinida'
- 'Iniopsis belongs to Eurhinodelphinoidea'
- 'Ischyrorhynchus belongs to Iniidae'
- 'Ixacanthus is a nomen dubium'
- 'Kampholophos belongs to Kentriodontinae'
- 'Kekenodon belongs to Kekenodontidae'
- 'Kekenodontinae was reranked as the family Kekenodontidae and belongs to Mysticeti'
- 'Kelloggia belongs to Squalodontidae'
- 'Kentriodon belongs to Kentriodontinae'
- 'Kentriodontidae belongs to Delphinoidea'
- 'Kentriodontinae belongs to Kentriodontidae'
- 'Karthlidelphis is a nomen dubium'
- 'Kharthlidelphis diceros is a nomen dubium'
- 'Kogia belongs to Kogiinae'
- 'Kogiidae belongs to Physeteroidea'
- 'Kogiinae belongs to Kogiidae'
- 'Kogiopsis is a nomen dubium'
- 'Lagenodelphis belongs to Delphininae'
- 'Lagenorhynchus belongs to Delphinidae'
- 'Lagenorhynchus (Leucopleurus) was reranked as Leucopleurus and belongs to Delphinidae'
- 'Lamprolithax belongs to Delphinoidea'
- 'Leptodelphis belongs to Pithanodelphinae'
- 'Liolithax belongs to Lophocetinae'
- 'Lipotes belongs to Lipotidae'
- 'Lipotidae belongs to Lipotoidea'
- 'Lipotoidea belongs to Delphinida'
- 'Lissodelphinae is corrected as Lissodelphininae and belongs to Delphinidae'
- 'Lissodelphis belongs to Lissodelphinae'
- 'Llanocetidae belongs to Mysticeti'
- 'Lomacetus belongs to Phocoeninae'
- 'Lonchodelphis is a nomen dubium'
- 'Lophocetinae belongs to Kentriodontidae'
- 'Lophocetus belongs to Lophocetinae'
- 'Loxolithax belongs to Phocoeninae'
- 'Macrodelphinus belongs to Eurhinodelphinidae'
- 'Macrokentriodon belongs to Kentriodontinae'
- 'Mammalodon belongs to Mammalodontidae'
- 'Mammalodontidae belongs to Mysticeti'
- 'Medocinia belongs to Squalodelphinidae'
- 'Mesoplodon belongs to Hyperoodontinae'
- 'Mesoplodon (Cetorhynchus) was reranked as Cetorhynchus and belongs to Ziphiinae'
- 'Messapicetus belongs to Ziphiinae'
- 'Metasqualodon is a nomen dubium'
- 'Metasqualodon symmetricus is a nomen dubium'
- 'Microcetus is a nomen dubium'
- 'Microcetus hectori is a nomen dubium'
- 'Microcetus sharkovi is a nomen dubium'
- 'Microzeuglodon is a nomen dubium'
- 'Microzeuglodontidae is a nomen nudum'
- 'Miodelphis belongs to Delphinoidea'
- 'Miokogia is a nomen dubium'
- 'Monodon belongs to Monodontinae'
- 'Monodontidae belongs to Delphinoidea'
- 'Monodontinae belongs to Monodontidae'
- 'Mysticeti belongs to Neoceti'
- 'Nannolithax belongs to Delphinoidea'
- 'Neobalaenidae belongs to Mysticeti'
- 'Neoceti belongs to Cetacea'
- 'Neophocaena belongs to Phocoeninae'
- 'Neosqualodon is a nomen dubium'
- 'Neosqualodon assenzae is a nomen dubium'
- 'Neosqualodon gastaldii gemmellaroi is a nomen dubium'
- 'Ninoziphius belongs to Ziphiinae'
- 'Notocetus belongs to Squalodelphinidae'
- 'Odobenocetops belongs to Odobenocetopsidae'
- 'Odobenocetopsidae belongs to Delphinoidea'
- 'Odontoceti belongs to Neoceti'
- 'Oedolithax belongs to Delphinoidea'
- 'Oligodelphis belongs to Delphinoidea'
- 'Oligodelphis azerbajdzanicus belongs to Oligodelphis' according to G. A. Mchedlidze and S. M. Aslanova 1968
- 'Ontocetus is a nomen dubium'
- 'Orca (Feresa) was reranked as Feresa and belongs to Globicephalinae'
- 'Orca (Orcaella) was reranked as Orcaella and belongs to Orcininae'
- 'Orcini was reranked as the subfamily Orcininae and belongs to Delphinidae'
- 'Orcinus belongs to Orcininae'
- 'Orcopsis is a nomen dubium'
- 'Orycterocetus belongs to Physeterinae'
- 'Pachyacanthus belongs to Delphinida'
- 'Pakicetinae was reranked as the family Pakicetidae and belongs to Archaeoceti'
- 'Palaeophocaena belongs to Delphinoidea'
- 'Paleoziphius is a nomen dubium'
- 'Paleophoca is a nomen dubium'
- 'Parapontoporia belongs to Lipotidae'
- 'Parasqualodon is a nomen dubium'
- 'Patriocetidae belongs to Odontoceti'
- 'Patriocetus belongs to Patriocetidae'
- 'Pelodelphis is a nomen dubium'
- 'Pelycorhamphus is a nomen dubium'
- 'Peponocephala belongs to Globicephalinae'
- 'Phoberodon belongs to Squalodontidae'
- 'Microcetus ambiguus is a nomen dubium'
- 'Phocaena is corrected as Phocoena and belongs to Phocoeninae'
- 'Phocaena dioptrica is recombined as Phocoena dioptrica'
- 'Champsodelphis euxinicus is a nomen dubium'
- 'Phocaenina was reranked as the family Phocoenidae and belongs to Delphinoidea'
- 'Phocaenopsis is a nomen dubium'
- 'Phocaenopsis mantelli is a nomen dubium'
- 'Phocaenopsis scheynensis is a nomen dubium'
- 'Phocageneus belongs to Squalodelphinidae'
- 'Phocoeninae belongs to Phocoenidae'
- 'Phocoenoides belongs to Phocoenoidinae'
- 'Phocoenoidinae belongs to Phocoenidae'
- 'Physeter belongs to Physeterinae'
- 'Physeterida belongs to Odontoceti'
- 'Physeteridae belongs to Physeteroidea'
- 'Physeteroidea belongs to Physeterida'
- 'Physeterula belongs to Physeterinae'
- 'Physetodon is a nomen dubium'
- 'Physotherium is a nomen dubium'
- 'Piscolithax belongs to Phocoenoidinae'
- 'Piscorhynchus is a subjective synonym of Piscolithax'
- 'Piscorhynchus aenigmaticus is recombined as Piscolithax aenigmaticus'
- 'Pithanodelphinae belongs to Kentriodontidae'
- 'Pithanodelphis belongs to Pithanodelphinae'
- 'Placoziphius belongs to Physeterinae'
- 'Platanista belongs to Platanistidae'
- 'Platanistida belongs to Odontoceti'
- 'Platanistina was reranked as the family Platanistidae and belongs to Platanistoidea'
- 'Platanistoidea belongs to Platanistida'
- 'Platydelphis is a nomen dubium'
- 'Platylithax belongs to Delphinoidea'
- 'Plicodontinia is a nomen dubium'
- 'Plicodontinia mourai is a nomen dubium'
- 'Pliopontos belongs to Pontoporiinae'
- 'Pomatodelphis belongs to Platanistidae'
- 'Pontistes belongs to Pontoporiidae'
- 'Pontivaga is a nomen dubium'
- 'Pontoporia belongs to Pontoporiinae'
- 'Pontoporiidae belongs to Inioidea'
- 'Pontoporiinae belongs to Pontoporiidae'
- 'Preaulophyseter belongs to Hoplocetinae'
- 'Prionodelphis is a nomen dubium'
- 'Prionodelphis rovereti is a nomen dubium'
- 'Priscodelphinus is a nomen dubium'
- 'Priscodelphinus acutidens is a nomen dubium'
- 'Priscodelphinus dectivus is a nomen dubium'
- 'Priscophyseter is a nomen dubium'
- 'Prolipotes is a nomen dubium'
- 'Prolipotes yujiangensis is a nomen dubium'
- 'Prophyseter is a nomen dubium'
- 'Prophyseter dolloi is a nomen dubium'
- 'Prosqualodon belongs to Prosqualodontidae'
- 'Prosqualodontidae belongs to Platanistoidea'
- 'Protocetidae belongs to Archaeoceti'
- 'Protocetinae belongs to Protocetidae'
- 'Protocetoidea is a nomen vanum'
- 'Protodelphinus belongs to Eurhinodelphinoidea'
- 'Protophocaena is a nomen dubium'
- 'Proroziphius is a nomen dubium'
- 'Pseudorca belongs to Globicephalinae'
- 'Remingtonocetidae belongs to Archaeoceti'
- 'Remingtonocetoidea is a nomen vanum'
- 'Rhabdosteidae is a subjective synonym of Eurhinodelphinidae'
- 'Rhabdosteus is a nomen dubium'
- 'Rhachianectes is a subjective synonym of Eschrichtius'
- 'Rhachianectidae is an objective synonym of Eschrichtiidae'
- 'Rhynostodes is a nomen nudum'
- 'Rhinostodes lovisatoi is a nomen dubium'
- 'Rhytisodon is a nomen dubium'
- 'Rhytisodon tuberculatus is a nomen dubium'
- 'Sachalinocetus belongs to Platanistoidea'
- 'Sagmatias belongs to Lissodelphinae'
- 'Sarmatodelphis belongs to Kentriodontidae'
- 'Saurocetes belongs to Iniidae'
- 'Saurocetus is a nomen dubium'
- 'Scaldicetus belongs to Hoplocetinae'
- 'Scaphokogia belongs to Scaphokogiinae'
- 'Scaphokogiinae belongs to Kogiidae'
- 'Scaptodon is a nomen dubium'
- 'Schizodelphis belongs to Eurhinodelphinidae'
- 'Miokogia elongatus is a nomen dubium'
- 'Sinanodelphis belongs to Delphinoidea'
- 'Sotalia belongs to Stenoninae'
- 'Sousa belongs to Delphininae'
- 'Squalodelphidae is corrected as Squalodelphinidae and belongs to Platanistoidea'
- 'Squalodelphis belongs to Squalodelphinidae'
- 'Squalodon belongs to Squalodontidae'
- 'Neosqualodon gastaldii is a nomen dubium'
- 'Trirhizodon gervaisii is a nomen dubium'
- 'Agriocetus incertus is a nomen dubium'
- 'Trirhizodon suessii is a nomen dubium'
- 'Parasqualodon wilkinsoni is a nomen dubium'
- 'Squalodontidae belongs to Platanistoidea'
- 'Squaloziphiinae belongs to Ziphiidae'
- 'Squaloziphius belongs to Squaloziphiinae'
- 'Steno belongs to Stenoninae'
- 'Steno (Stenella) was reranked as Stenella and belongs to Delphininae'
- 'Stenoninae belongs to Delphinidae'
- 'Stereodelphis is a nomen dubium'
- 'Sulakocetus belongs to Waipatiidae'
- 'Tasmacetus belongs to Ziphiinae'
- 'Thalassocetus is a nomen dubium'
- 'Thalassocetus antwerpiensis is a nomen dubium'
- 'Tretosphys is a nomen dubium'
- 'Trirhizodon is a nomen dubium'
- 'Tursiops belongs to Delphininae'
- 'Tusciziphius belongs to Hyperoodontinae'
- 'Uranocetus belongs to Pontoporiinae'
- 'Waipatia belongs to Waipatiidae'
- 'Waipatiidae belongs to Platanistoidea'
- 'Xenorophus belongs to Odontoceti'
- 'Zarhachis belongs to Platanistidae'
- 'Metasqualodon harwoodi is a nomen dubium'
- 'Ziphiidae was reranked as the tribe Ziphiina and belongs to Ziphioidea'
- 'Ziphiodelphis belongs to Eurhinodelphinidae'
- 'Ziphioidea belongs to Physeterida'
- 'Ziphioides is a nomen dubium'
- 'Ziphioides obliquus is a nomen dubium'
- 'Ziphioides triangulus is a nomen dubium'
- 'Ziphirostrum belongs to Ziphiinae'
- 'Ziphius belongs to Ziphiinae'