Opinions from J. E. Gray 1864
- 'Balaena belongs to Balaenidae'
- 'Balaena (Caperea) antipodarum belongs to Balaena (Caperea)'
- 'Balaena ampullata is recombined as Lagenocetus latifrons'
- 'Balaena antarctica is a subjective synonym of Eubalaena australis'
- 'Balaena antiquorum is recombined as Physalus antiquorum'
- 'Balaena australis is recombined as Eubalaena australis'
- 'Balaena longimana is recombined as Megaptera longimana'
- 'Balaena mysticetus belongs to Balaena'
- 'Balaena rostrata is recombined as Balaenoptera rostrata'
- 'Balaenoptera belongs to Balaenopteridae'
- 'Balaenoptera laticeps is recombined as Sibbaldus laticeps'
- 'Balaenopteridae belongs to Mysticete'
- 'Beluga belongs to Phocaenina'
- 'Benedenia belongs to Balaenopteridae'
- 'Benedenia knoxii belongs to Benedenia'
- 'Caperea was reranked as Balaena (Caperea) and belongs to Balaena'
- 'Catodon belongs to Catodontidae'
- 'Catodontidae belongs to Denticete'
- 'Cete was reranked as a suborder and belongs to Cetacea'
- 'Delphinidae belongs to Denticete'
- 'Delphinina was reranked as a tribe and belongs to Delphinidae'
- 'Delphinus belongs to Delphinina'
- 'Delphinus (Clymene) belongs to Delphinus'
- 'Delphinus (Grampus) was reranked as Grampus and belongs to Phocaenina'
- 'Delphinus (Grampus) acutus is recombined as Lagenorhynchus acutus'
- 'Delphinus albirostris is recombined as Lagenorhynchus albirostris'
- 'Delphinus delphis belongs to Delphinus'
- 'Delphinus desmarestii is recombined as Aliama desmarestii'
- 'Delphinus euphrosyne is recombined as Delphinus (Clymene) euphrosyne'
- 'Delphinus leucopleurus is recombined as Lagenorhynchus leucopleurus'
- 'Delphinus rostratus is recombined as Steno rostratus'
- 'Delphinus sowerbiensis is recombined as Ziphius sowerbiensis'
- 'Delphinus tursio is recombined as Delphinus (Clymene) tursio'
- 'Denticete was reranked as a unranked clade and belongs to Cete'
- 'Eubalaena belongs to Balaenidae'
- 'Globicephalus svineval [misspelled as Globiocephalus svineval] belongs to Globiocephalus'
- 'Globiocephalina belongs to Delphinidae'
- 'Globiocephalus belongs to Globiocephalina'
- 'Globiocephalus affinis belongs to Globiocephalus'
- 'Globiocephalus incrassatus belongs to Globiocephalus'
- 'Grampus cuvieri belongs to Grampus'
- 'Hyperoodon [misspelled as Hyperodon] belongs to Hyperoodontina'
- 'Hyperoodon butskopf [misspelled as Hyperodon butskopf] belongs to Hyperoodon'
- 'Hyperoodontina belongs to Delphinidae'
- 'Lagenocetus belongs to Hyperoodontina'
- 'Lagenorhynchus belongs to Delphinina'
- 'Manatidae belongs to Sirenia'
- 'Manatus belongs to Manatidae'
- 'Manatus australis belongs to Manatus'
- 'Megaptera belongs to Balaenopteridae'
- 'Megaptera (Poescopia) belongs to Megaptera'
- 'Megaptera lalandii belongs to Megaptera'
- 'Megaptera novaezelandiae belongs to Megaptera'
- 'Monodon belongs to Phocaenina'
- 'Monodon monoceros belongs to Monodon'
- 'Mysticete was reranked as a unranked clade and belongs to Cete'
- 'Orca belongs to Phocaenina'
- 'Orca gladiator belongs to Orca'
- 'Phocaena belongs to Phocaenina'
- 'Phocaena communis belongs to Phocaena'
- 'Phocaena crassidens is recombined as Orca crassidens'
- 'Phocaenina belongs to Delphinidae'
- 'Physalina belongs to Balaenopteridae'
- 'Physalus belongs to Balaenopteridae'
- 'Physalus duguidii belongs to Physalus'
- 'Physalus sibbaldii belongs to Physalus'
- 'Physeter belongs to Catodontidae'
- 'Physeter macrocephalus is recombined as Catodon macrocephalus'
- 'Physeter tursio belongs to Physeter'
- 'Sibbaldus belongs to Balaenopteridae'
- 'Sibbaldus borealis belongs to Sibbaldus'
- 'Sirenia was reranked as a suborder and belongs to Cetacea'
- 'Steno belongs to Delphinina'
- 'Ziphiidae was reranked as the tribe Ziphiina and belongs to Delphinidae'