Opinions from T. Gill 1872
- 'Agaphelidae was reranked as the subfamily Agaphelinae and belongs to Balaenopteridae'
- 'Agaphelus belongs to Agaphelinae'
- 'Anarnacinae belongs to Ziphiidae'
- 'Anarnak is corrected as Anarnacus and belongs to Anarnacinae'
- 'Anoplonassa belongs to Sirenia'
- 'Aporotus belongs to Ziphiidae'
- 'Balaenopteridae belongs to Mysticete'
- 'Basilosauridae belongs to Zeuglodontia'
- 'Belemnoziphius belongs to Ziphiidae'
- 'Berardius belongs to Ziphiinae'
- 'Callignathus belongs to Kogiinae'
- 'Cephalorhynchus belongs to Delphininae'
- 'Cete belongs to Educabilia'
- 'Cheirotherium belongs to Halitheriidae'
- 'Choneziphius belongs to Ziphiidae'
- 'Colophonodon is a subjective synonym of Squalodon'
- 'Crassitherium belongs to Sirenia'
- 'Cynorca belongs to Cynorcidae'
- 'Cynorcidae belongs to Zeuglodontia'
- 'Delphinapterinae belongs to Delphinidae'
- 'Delphinapterus belongs to Delphinapterinae'
- 'Delphinidae belongs to Denticete'
- 'Delphininae belongs to Delphinidae'
- 'Delphinodon belongs to Cynorcidae'
- 'Delphinus belongs to Delphininae'
- 'Delphinus (Clymene) was reranked as Clymenia and belongs to Delphininae'
- 'Denticete belongs to Cete'
- 'Durodon is a subjective synonym of Basilosaurus'
- 'Educabilia belongs to Placentalia'
- 'Eutropia is a subjective synonym of Cephalorhynchus'
- 'Fucotherium belongs to Halitheriidae'
- 'Globicephala [misspelled as Globicephalus] belongs to Delphininae'
- 'Globiocephalidae was reranked as the subfamily Globiocephalinae and belongs to Delphinidae'
- 'Halianassa is a subjective synonym of Halitherium'
- 'Halicore belongs to Halicoridae'
- 'Halicoridae belongs to Halicoroidea'
- 'Halicoroidea belongs to Sirenia'
- 'Halitheriidae belongs to Halicoroidea'
- 'Halitherium belongs to Halitheriidae'
- 'Hemicaulodon belongs to Sirenia'
- 'Hydrarchos is a subjective synonym of Basilosaurus'
- 'Inia belongs to Iniidae'
- 'Iniana was reranked as the family Iniidae and belongs to Denticete'
- 'Ixacanthus belongs to Iniidae'
- 'Kogia belongs to Kogiinae'
- 'Kogiinae belongs to Physeteridae'
- 'Lagenorhynchus belongs to Delphininae'
- 'Leucorhamphus belongs to Delphininae'
- 'Mesoplodon belongs to Ziphiinae'
- 'Metaxytherium belongs to Halitheriidae'
- 'Monodelphia belongs to Mammalia'
- 'Monotremata belongs to Ornithodelphia'
- 'Mysticete belongs to Cete'
- 'Neomeris belongs to Delphininae'
- 'Orca belongs to Delphininae'
- 'Orca (Orcaella) was reranked as Orcaella and belongs to Delphininae'
- 'Ornithodelphia was reranked as a subclass and belongs to Mammalia'
- 'Ornithorhynchidae belongs to Platypoda'
- 'Phocaena is corrected as Phocoena and belongs to Delphininae'
- 'Physeter belongs to Physeterinae'
- 'Physeteridae belongs to Physeteroidea'
- 'Physeterinae belongs to Physeteridae'
- 'Physeteroidea belongs to Denticete'
- 'Placoziphius belongs to Ziphiidae'
- 'Platanista belongs to Platanistidae'
- 'Platanistina was reranked as the family Platanistidae and belongs to Denticete'
- 'Platypoda belongs to Monotremata'
- 'Polyptychodon is a subjective synonym of Basilosaurus'
- 'Pontoporia belongs to Pontoporiinae'
- 'Pontoporiinae belongs to Delphinidae'
- 'Pontotherium belongs to Halitheriidae'
- 'Portheodon belongs to Cynorcidae'
- 'Priscodelphinus belongs to Iniidae'
- 'Prorastomus belongs to Sirenia'
- 'Pseudorca belongs to Delphininae'
- 'Pugmeodon belongs to Halitheriidae'
- 'Rhabdosteidae belongs to Rhabdosteoidea'
- 'Rhabdosteoidea belongs to Denticete'
- 'Rhabdosteus belongs to Rhabdosteidae'
- 'Rhachianectes [misspelled as Rachianectes] belongs to Agaphelinae'
- 'Rhinostodes belongs to Ziphiidae'
- 'Rhytina belongs to Rhytinidae'
- 'Rhytinidae belongs to Halicoroidea'
- 'Sagmatias belongs to Delphininae'
- 'Saurocetus belongs to Cynorcidae'
- 'Sirenia was reranked as a order and belongs to Educabilia'
- 'Sotalia belongs to Delphininae'
- 'Squalodon belongs to Cynorcidae'
- 'Steno belongs to Delphininae'
- 'Stenodon belongs to Cynorcidae'
- 'Tachyglossa belongs to Monotremata'
- 'Tachyglossidae belongs to Tachyglossa'
- 'Trachytherium belongs to Sirenia'
- 'Tretosphys belongs to Iniidae'
- 'Trichechoidea belongs to Sirenia'
- 'Trichechus belongs to Trichechidae'
- 'Trichecidae is corrected as Trichechidae and belongs to Trichechoidea'
- 'Tursio is a subjective synonym of Tursiops'
- 'Tursiops belongs to Delphininae'
- 'Zarhachis belongs to Iniidae'
- 'Zeuglodon is a subjective synonym of Basilosaurus'
- 'Zeuglodontes was reranked as the suborder Zeuglodontia and belongs to Cete'
- 'Ziphiidae was reranked as the tribe Ziphiina and belongs to Denticete'
- 'Ziphiopsis belongs to Ziphiidae'
- 'Ziphirostrum belongs to Ziphiidae'
- 'Ziphius belongs to Ziphiinae'