Opinions from T. Gill 1871
- 'Agaphelidae was reranked as the subfamily Agaphelinae and belongs to Balaenopteridae'
- 'Agaphelus belongs to Agaphelinae'
- 'Anarnak is corrected as Anarnacus and belongs to Anarnacinae'
- 'Balaena belongs to Balaenidae'
- 'Balaenoptera belongs to Balaenopterinae'
- 'Balaenopteridae belongs to Mysticete'
- 'Balaenopterinae belongs to Balaenopteridae'
- 'Balanadae is corrected as Balaenidae and belongs to Mysticete'
- 'Basilosauridae belongs to Zeuglodontia'
- 'Basilosaurus belongs to Basilosauridae'
- 'Beluga is a subjective synonym of Delphinapterus'
- 'Berardius belongs to Ziphiinae'
- 'Callignathus belongs to Kogiinae'
- 'Catodon is a subjective synonym of Physeter'
- 'Colophonodon belongs to Cynorcidae'
- 'Cynorca belongs to Cynorcidae'
- 'Cynorcidae belongs to Zeuglodontia'
- 'Delphinapterinae belongs to Delphinidae'
- 'Delphinapterus belongs to Delphinapterinae'
- 'Delphinidae belongs to Denticete'
- 'Delphininae belongs to Delphinidae'
- 'Delphinus belongs to Delphininae'
- 'Denticete belongs to Cetacea'
- 'Dioplodon belongs to Ziphiinae'
- 'Eubalaena belongs to Balaenidae'
- 'Globicephala [misspelled as Globicephalus] belongs to Globicephalinae'
- 'Globiocephalidae was reranked as the subfamily Globiocephalinae and belongs to Delphinidae'
- 'Hunterius belongs to Balaenidae'
- 'Inia belongs to Iniinae'
- 'Iniinae belongs to Platanistidae'
- 'Kogia belongs to Kogiinae'
- 'Kogiinae belongs to Physeteridae'
- 'Lagenorhynchus belongs to Delphininae'
- 'Leucorhamphus belongs to Delphininae'
- 'Lophocetus belongs to Pontoporiinae'
- 'Megaptera belongs to Megapterinae'
- 'Megaptera (Eschrichtius) was reranked as Eschrichtius and belongs to Megapterinae'
- 'Megapterinae belongs to Balaenopteridae'
- 'Mesoplodon belongs to Ziphiinae'
- 'Mysticete belongs to Cetacea'
- 'Neomeris belongs to Delphininae'
- 'Ontocetus belongs to Physeteridae'
- 'Orca belongs to Delphininae'
- 'Orca (Orcaella) was reranked as Orcaella and belongs to Delphininae'
- 'Orycterocetus belongs to Physeteridae'
- 'Palaeocetus belongs to Balaenidae'
- 'Phocaena belongs to Delphininae'
- 'Physalus belongs to Balaenopterinae'
- 'Physeter belongs to Physeterinae'
- 'Physeteridae belongs to Denticete'
- 'Physeterinae belongs to Physeteridae'
- 'Platanista belongs to Platanistinae'
- 'Platanistina was reranked as the family Platanistidae and belongs to Denticete'
- 'Platanistinae belongs to Platanistidae'
- 'Pontoporia belongs to Pontoporiinae'
- 'Pontoporiinae belongs to Platanistidae'
- 'Priscodelphinus belongs to Platanistidae'
- 'Pseudorca belongs to Delphininae'
- 'Rhabdosteidae belongs to Denticete'
- 'Rhabdosteus belongs to Rhabdosteidae'
- 'Rhachianectes belongs to Agaphelinae'
- 'Sagmatias belongs to Delphininae'
- 'Sibbaldus belongs to Balaenopterinae'
- 'Sotalia belongs to Delphininae'
- 'Squalodon belongs to Cynorcidae'
- 'Steno belongs to Delphininae'
- 'Stenodon belongs to Cynorcidae'
- 'Tretosphys belongs to Platanistidae'
- 'Tursio is a subjective synonym of Tursiops'
- 'Tursiops belongs to Delphininae'
- 'Zarhachis belongs to Platanistidae'
- 'Zeuglodon is a subjective synonym of Basilosaurus'
- 'Zeuglodontes was reranked as the suborder Zeuglodontia and belongs to Cetacea'
- 'Ziphiidae belongs to Denticete'
- 'Ziphius belongs to Ziphiinae'