Opinions from C. de Muizon 1988
- 'Albireonidae belongs to Delphinoidea'
- 'Atocetus belongs to Pithanodelphinae'
- 'Australithax belongs to Phocoeninae'
- 'Australophocaena belongs to Phocoenoidinae'
- 'Belonodelphis belongs to Kentriodontinae'
- 'Brachydelphis belongs to Brachydelphinae'
- 'Cephalorhynchinae belongs to Delphinidae'
- 'Cephalorhynchus belongs to Cephalorhynchinae'
- 'Delphinapterus belongs to Delphinapterinae'
- 'Delphinavus belongs to Delphinoidea'
- 'Delphinida belongs to Odontoceti'
- 'Delphinidae belongs to Delphinoidea'
- 'Delphinodon belongs to Kentriodontinae'
- 'Delphinoidea belongs to Delphinida'
- 'Delphinus belongs to Delphininae'
- 'Delphinus (Grampus) was reranked as Grampus and belongs to Delphininae'
- 'Lonchodelphis occiduus is a nomen dubium'
- 'Delphinus phocoena is recombined as Phocoena phocoena' according to Cuvier 1817
- 'Denebola belongs to Monodontidae'
- 'Goniodelphis belongs to Iniidae'
- 'Goniodelphis hudsoni belongs to Goniodelphis'
- 'Hadrodelphis belongs to Lophocetinae'
- 'Hesperocetus is a nomen dubium'
- 'Hesperocetus californicus is a nomen dubium'
- 'Hesperoinia is a nomen dubium'
- 'Hesperoinia dalpiazi is a nomen dubium'
- 'Heterodelphis belongs to Delphinida'
- 'Imerodelphis belongs to Odontoceti'
- 'Incacetus belongs to Kentriodontinae'
- 'Iniana was reranked as the family Iniidae and belongs to Inioidea'
- 'Inioidea belongs to Delphinida'
- 'Kampholophos belongs to Kentriodontinae'
- 'Kentriodon belongs to Kentriodontinae'
- 'Kentriodontidae belongs to Delphinoidea'
- 'Lagenodelphis belongs to Delphininae'
- 'Lagenorhynchus belongs to Delphininae'
- 'Lamprolithax belongs to Delphinoidea'
- 'Leptodelphis belongs to Pithanodelphinae'
- 'Liolithax belongs to Pithanodelphinae'
- 'Lipotes belongs to Lipotidae'
- 'Lipotidae belongs to Lipotoidea'
- 'Lipotoidea belongs to Delphinida'
- 'Lissodelphis belongs to Delphininae'
- 'Lomacetus belongs to Phocoeninae'
- 'Lonchodelphis is a nomen dubium'
- 'Lophocetus belongs to Lophocetinae'
- 'Loxolithax belongs to Delphinoidea'
- 'Microphocaena belongs to Phocoeninae'
- 'Monodon belongs to Monodontinae'
- 'Monodontidae belongs to Delphinoidea'
- 'Nannolithax belongs to Delphinoidea'
- 'Neophocaena belongs to Phocoeninae'
- 'Oedolithax belongs to Delphinoidea'
- 'Oligodelphis belongs to Kentriodontidae'
- 'Orca (Feresa) was reranked as Feresa and belongs to Globicephalinae'
- 'Orca (Orcaella) was reranked as Orcaella and belongs to Globicephalinae'
- 'Parapontoporia belongs to Lipotidae'
- 'Pelodelphis belongs to Delphinoidea'
- 'Peponocephala belongs to Globicephalinae'
- 'Phocaena belongs to Phocoeninae'
- 'Phocaenina was reranked as the family Phocaenidae and belongs to Delphinoidea'
- 'Phocoenoides belongs to Phocoenoidinae'
- 'Piscolithax belongs to Phocoenoidinae'
- 'Pithanodelphis belongs to Pithanodelphinae'
- 'Platylithax belongs to Delphinoidea'
- 'Plicodontinia is a nomen dubium'
- 'Plicodontinia mourai is a nomen dubium'
- 'Pliopontos belongs to Pontoporiinae'
- 'Pontistes belongs to Pontoporiinae'
- 'Pontivaga is a nomen dubium'
- 'Pontivaga fischeri is a nomen dubium'
- 'Pontoporia belongs to Pontoporiinae'
- 'Pontoporiidae belongs to Inioidea'
- 'Proinia is a nomen dubium'
- 'Proinia patagonica is a nomen dubium'
- 'Prolipotes is a nomen dubium'
- 'Prolipotes yujiangensis is a nomen dubium'
- 'Salumiphocaena belongs to Phocoenoidinae'
- 'Sarmatodelphis belongs to Kentriodontidae'
- 'Saurocetes belongs to Odontoceti'
- 'Sotalia belongs to Delphininae'
- 'Sousa belongs to Delphininae'
- 'Steno belongs to Delphininae'
- 'Steno (Stenella) was reranked as Stenella and belongs to Delphininae'
- 'Tursiops belongs to Delphininae'