Opinions from L. P. Bergqvist et al. 1999
- 'Archaeoceti belongs to Cetacea'
- 'Arctocephalus belongs to Otariidae'
- 'Balaena australis is recombined as Eubalaena australis'
- 'Balaena musculus is recombined as Balaenoptera musculus'
- 'Balaena novaeangliae is recombined as Megaptera novaeangliae'
- 'Balaenoptera belongs to Balaenopterinae'
- 'Balaenopteridae belongs to Mysticeti'
- 'Balaenopterinae belongs to Balaenopteridae'
- 'Balanadae is corrected as Balaenidae and belongs to Mysticeti'
- 'Basilosauridae belongs to Archaeoceti'
- 'Basilosaurus belongs to Basilosauridae'
- 'Delphinus blainvillei is recombined as Pontoporia blainvillei'
- 'Dioplotherium belongs to Rytiodontinae'
- 'Dugongidae belongs to Sirenia'
- 'Eubalaena belongs to Balaenidae'
- 'Halianassa allisoni is recombined as Dioplotherium allisoni'
- 'Halitheriidae was reranked as the subfamily Halitheriinae and belongs to Dugongidae'
- 'Iniana was reranked as the family Iniidae and belongs to Odontoceti'
- 'Ischyrorhynchus belongs to Iniidae'
- 'Megaptera belongs to Megapterinae'
- 'Megapterinae belongs to Balaenopteridae'
- 'Metaxytherium belongs to Halitheriinae'
- 'Mysticeti belongs to Cetacea'
- 'Odontoceti belongs to Cetacea'
- 'Otaria belongs to Otariidae'
- 'Otaria byronia belongs to Otaria'
- 'Otariina was reranked as the family Otariidae and belongs to Carnivora'
- 'Plicodontinia belongs to Iniidae'
- 'Plicodontinia mourai belongs to Plicodontinia'
- 'Pontoporia belongs to Pontoporiinae'
- 'Pontoporiidae belongs to Odontoceti'
- 'Pontoporiinae belongs to Pontoporiidae'
- 'Ribodon belongs to Trichechidae'
- 'Rytiodontinae belongs to Dugongidae'
- 'Rytiodus belongs to Rytiodontinae'
- 'Trichechus belongs to Trichechidae'
- 'Trichecidae is corrected as Trichechidae and belongs to Sirenia'
- 'Zeuglodon is a subjective synonym of Basilosaurus'
- 'Ziphiidae belongs to Mysticeti'