Opinions from J. E. Gray 1868
- 'Balaena belongs to Balaenidae'
- 'Balaena (Caperea) antipodarum is recombined as Caperea antipodarum'
- 'Balaena ampullata is recombined as Lagenocetus latifrons'
- 'Balaena antiquorum is recombined as Physalus antiquorum'
- 'Balaena australis is recombined as Eubalaena australis'
- 'Balaena longimana is recombined as Megaptera longimana'
- 'Balaena marginata belongs to Balaena'
- 'Balaena mysticetus belongs to Balaena'
- 'Balaena rostrata is recombined as Balaenoptera rostrata'
- 'Balaena sieboldii is recombined as Eubalaena sieboldii'
- 'Balaenoidea belongs to Mysticete'
- 'Balaenoptera belongs to Balaenopteridae'
- 'Balaenoptera laticeps is recombined as Rudolphius laticeps'
- 'Balaenoptera patachonica is recombined as Physalus patachonicus'
- 'Balaenoptera robusta is recombined as Eschrichtius robustus'
- 'Balaenoptera schlegelii is recombined as Sibbaldius schlegellii'
- 'Balaenoptera swinhoei is a subjective synonym of Swinhoia chinensis'
- 'Balaenopteridae belongs to Balaenopteroidea'
- 'Balaenopteroidea belongs to Mysticete'
- 'Balanadae is corrected as Balaenidae and belongs to Balaenoidea'
- 'Beluga belongs to Belugidae'
- 'Beluginae was reranked as the family Belugidae and belongs to Delphinoidea'
- 'Benedenia belongs to Physalinidae'
- 'Benedenia knoxii belongs to Benedenia'
- 'Berardius belongs to Ziphiidae'
- 'Berardius arnuxii [misspelled as Berardius arnuxi] belongs to Berardius'
- 'Caperea belongs to Balaenidae'
- 'Catodon belongs to Catodontidae'
- 'Catodontidae belongs to Physeteroidea'
- 'Clymenia euphrosynoides belongs to Clymenia'
- 'Clymenia normalis belongs to Clymenia'
- 'Clymenia similis belongs to Clymenia'
- 'Cuvierius belongs to Physalinidae'
- 'Delphinapterus belongs to Delphinina'
- 'Delphinidae belongs to Delphinoidea'
- 'Delphinina belongs to Delphinidae'
- 'Delphinoidea belongs to Denticete'
- 'Delphinus belongs to Delphinina'
- 'Delphinus (Clymene) was reranked as Clymenia and belongs to Delphinina'
- 'Delphinus (Grampus) was reranked as Grampus and belongs to Belugidae'
- 'Delphinus (Grampus) heavisidii is recombined as Eutropia heavisidii'
- 'Delphinus (Grampus) obscurus is recombined as Clymenia obscura'
- 'Delphinus (Steno) gadamu is recombined as Clymenia gudamu'
- 'Delphinus (Steno) lentiginosus is recombined as Steno lentiginosus'
- 'Delphinus albirostris is recombined as Lagenorhynchus albirostris'
- 'Delphinus alope is recombined as Clymenia alope'
- 'Delphinus blainvillei is recombined as Pontoporia blainvillii'
- 'Delphinus catalania is recombined as Tursio catalania'
- 'Delphinus clymene is a subjective synonym of Clymenia normalis'
- 'Delphinus compressus is recombined as Steno compressus'
- 'Delphinus cymodoce is recombined as Tursio cymodoce'
- 'Delphinus delphis belongs to Delphinus'
- 'Delphinus desmarestii is recombined as Epiodon desmarestii'
- 'Delphinus doris is recombined as Clymenia doris'
- 'Delphinus euphrosyne is recombined as Clymenia euphrosyne'
- 'Delphinus eurynome is recombined as Tursio eurynome'
- 'Delphinus forsteri belongs to Delphinus'
- 'Delphinus frontatus is recombined as Steno frontatus'
- 'Delphinus fusiformis belongs to Delphinus' according to Owen 1866
- 'Delphinus fusiformis is recombined as Electra fusiformis'
- 'Delphinus gangeticus is recombined as Platanista gangetica'
- 'Delphinus geoffrensis is recombined as Inia geoffroyii'
- 'Delphinus guianensis is recombined as Sotalia guianensis'
- 'Delphinus intermedius is recombined as Orca intermedia'
- 'Delphinus janira belongs to Delphinus'
- 'Delphinus kingii is recombined as Beluga kingii'
- 'Delphinus longirostris belongs to Delphinus'
- 'Delphinus major belongs to Delphinus'
- 'Delphinus metis is recombined as Tursio metis'
- 'Delphinus microps is recombined as Clymenia microps'
- 'Delphinus moorii is corrected as Delphinus moorei and belongs to Delphinus'
- 'Delphinus peronii is recombined as Delphinapterus peronii'
- 'Delphinus phocaenoides is recombined as Neomeris phocaenoides'
- 'Delphinus pomeegra belongs to Delphinus'
- 'Delphinus sowerbiensis is recombined as Ziphius sowerbiensis'
- 'Delphinus stenorhynchus is recombined as Clymenia stenorhynchus'
- 'Delphinus styx is recombined as Clymenia styx'
- 'Delphinus tursio is replaced by Tursio truncatus'
- 'Delphinus walkeri belongs to Delphinus'
- 'Denticete was reranked as a unranked clade and belongs to Cete'
- 'Dioplodon belongs to Ziphiidae'
- 'Electra obtusa belongs to Electra'
- 'Epiodon belongs to Epiodontidae'
- 'Epiodon cryptodon belongs to Epiodon'
- 'Epiodontina was reranked as the tribe Epiodontidae and belongs to Ziphioidea'
- 'Eubalaena belongs to Balaenidae'
- 'Euphysetes belongs to Physeteridae'
- 'Euphysetes grayii belongs to Euphysetes'
- 'Euphysetes macleayi is recombined as Kogia macleayii'
- 'Eutropia belongs to Delphinina'
- 'Eutropia dickiei belongs to Eutropia' according to J. E. Gray 1866
- 'Eutropia dickiei belongs to Eutropia'
- 'Globicephalus macrorhynchus is recombined as Globiocephalus macrorhynchus'
- 'Globicephalus svineval is recombined as Globiocephalus svineval'
- 'Globiocephalidae belongs to Delphinoidea'
- 'Globiocephalus belongs to Globiocephalidae'
- 'Grampus cuvieri belongs to Grampus'
- 'Grampus richardsonii belongs to Grampus'
- 'Hunterius belongs to Balaenidae'
- 'Hunterius svendenborgii [misspelled as Hunterius swedenborgii] belongs to Hunterius'
- 'Hunterius temminckii belongs to Hunterius'
- 'Hyperoodon belongs to Hyperoodontidae'
- 'Hyperoodon butskopf belongs to Hyperoodon'
- 'Hyperoodon capensis is recombined as Petrorhynchus capensis'
- 'Hyperoodontina was reranked as the family Hyperoodontidae and belongs to Ziphioidea'
- 'Inia belongs to Iniidae'
- 'Iniana was reranked as the family Iniidae and belongs to Delphinoidea'
- 'Lagenocetus belongs to Hyperoodontidae'
- 'Lagenorhynchina belongs to Delphinidae'
- 'Lagenorhynchus belongs to Lagenorhynchina'
- 'Lagenorhynchus (Electra) was reranked as Electra and belongs to Lagenorhynchina'
- 'Lagenorhynchus (Leucopleurus) was reranked as Leucopleurus and belongs to Lagenorhynchina'
- 'Lagenorhynchus asia is recombined as Electra asia'
- 'Lagenorhynchus clanculus is recombined as Electra clanculus'
- 'Lagenorhynchus electra is replaced by Electra obtusa'
- 'Lagenorhynchus thicolea is recombined as Electra thicolea'
- 'Leucopleurus arcticus belongs to Leucopleurus'
- 'Macleayius belongs to Balaenidae'
- 'Macleayius australiensis belongs to Macleayius'
- 'Meganeuron belongs to Catodontidae'
- 'Meganeuron krefftii belongs to Meganeuron'
- 'Megaptera belongs to Megapteridae'
- 'Megaptera (Eschrichtius) was reranked as Eschrichtius and belongs to Megapteridae'
- 'Megaptera (Poescopia) was reranked as Poescopia and belongs to Megapteridae'
- 'Megaptera novaezelandiae belongs to Megaptera'
- 'Megapterinae was reranked as the family Megapteridae and belongs to Balaenopteroidea'
- 'Monodon belongs to Belugidae'
- 'Monodon monoceros belongs to Monodon'
- 'Mysticete belongs to Cetacea'
- 'Neomeris belongs to Phocaenina'
- 'Orca belongs to Orcadina'
- 'Orca (Ophysia) belongs to Orca'
- 'Orca (Orcaella) was reranked as Orcaella and belongs to Delphinina'
- 'Orca (Orcaella) brevirostris is recombined as Orca brevirostris'
- 'Orca (Pseudorca) meridionalis is recombined as Pseudorca meridionalis'
- 'Orca capensis is recombined as Orca (Ophysia) capensis'
- 'Orca gladiator belongs to Orca'
- 'Orca magellanica belongs to Orca' according to Burmeister 1866
- 'Orca magellanica belongs to Orca'
- 'Orcadina belongs to Delphinidae'
- 'Petrorhynchus belongs to Epiodontidae'
- 'Phocaena belongs to Phocaenina'
- 'Phocaena (Acanthodelphis) was reranked as Acanthodelphis and belongs to Phocaenina'
- 'Phocaena communis belongs to Phocaena'
- 'Phocaena crassidens is recombined as Pseudorca crassidens'
- 'Phocaena spinipinnis is recombined as Acanthodelphis spinipennis'
- 'Phocaenina belongs to Delphinidae'
- 'Physalina was reranked as the family Physalinidae and belongs to Balaenopteroidea'
- 'Physalus belongs to Physalinidae'
- 'Physalus duguidii belongs to Physalus'
- 'Physalus sibbaldii is recombined as Cuvierius sibbaldii'
- 'Physeter belongs to Physeteridae'
- 'Physeter breviceps is recombined as Kogia breviceps'
- 'Physeter catodon belongs to Physeter'
- 'Physeter macrocephalus is recombined as Catodon macrocephalus'
- 'Physeter tursio belongs to Physeter'
- 'Physeteridae belongs to Physeteroidea'
- 'Platanista belongs to Platanistidae'
- 'Platanista indi belongs to Platanista'
- 'Platanistina was reranked as the family Platanistidae and belongs to Susoidea'
- 'Poescopia lalandii belongs to Poescopia'
- 'Pontoporia belongs to Stenonina'
- 'Pseudorca belongs to Phocaenina'
- 'Sibbaldius (Rudolphius) was reranked as Rudolphius and belongs to Physalinidae'
- 'Sibbaldius antarcticus belongs to Sibbaldius'
- 'Sibbaldus is corrected as Sibbaldius and belongs to Physalinidae'
- 'Sibbaldus borealis is recombined as Sibbaldius borealis'
- 'Sotalia belongs to Delphinina'
- 'Sphaerocephalus belongs to Globiocephalidae'
- 'Sphaerocephalus incrassatus belongs to Sphaerocephalus'
- 'Steno belongs to Stenonina'
- 'Steno attenuatus belongs to Steno'
- 'Steno fuscus belongs to Steno'
- 'Steno tucuxi belongs to Steno'
- 'Stenonina belongs to Delphinidae'
- 'Susoidea belongs to Denticete'
- 'Swinhoia belongs to Balaenopteridae'
- 'Swinhoia chinensis belongs to Swinhoia'
- 'Tursio belongs to Delphinina'
- 'Tursio truncatus belongs to Tursio'
- 'Ziphiidae belongs to Ziphioidea'
- 'Ziphioidea was reranked as a superfamily and belongs to Denticete'
- 'Ziphius belongs to Ziphiidae'
- 'Ziphius (Dolichodon) was reranked as Dolichodon and belongs to Ziphiidae'
- 'Ziphius layardii is recombined as Dolichodon layardii'
- 'Ziphius sechellensis is recombined as Dioplodon sechellensis'