Opinions from J. E. Gray 1850
- 'Balaena belongs to Balaenidae'
- 'Balaena antarctica belongs to Balaena'
- 'Balaena antiquorum is recombined as Physalus antiquorum'
- 'Balaena australis belongs to Balaena'
- 'Balaena gibbosa belongs to Balaena'
- 'Balaena japonica belongs to Balaena'
- 'Balaena longimana is recombined as Megaptera longimana'
- 'Balaena marginata belongs to Balaena'
- 'Balaena mysticetus belongs to Balaena'
- 'Balaena rostrata is recombined as Balaenoptera rostrata'
- 'Balaenoptera belongs to Balaenidae'
- 'Balaenoptera antarctica is recombined as Physalus antarcticus'
- 'Balaenoptera australis is recombined as Physalus australis'
- 'Balaenoptera brasiliensis is recombined as Physalus brasiliensis'
- 'Balaenoptera iwasi is recombined as Physalus iwasi'
- 'Balanadae is corrected as Balaenidae and belongs to Cete'
- 'Beluga belongs to Delphinidae'
- 'Beluga catodon belongs to Beluga'
- 'Catodon belongs to Catodontidae'
- 'Catodon colneti belongs to Catodon'
- 'Catodontidae belongs to Cete'
- 'Cete belongs to Mammalia'
- 'Delphinapterus belongs to Delphinidae'
- 'Delphinapterus borealis belongs to Delphinapterus'
- 'Delphinidae belongs to Cete'
- 'Delphinus belongs to Delphinidae'
- 'Delphinus (Delphinorhynchus) was reranked as Delphinorhynchus and belongs to Delphinidae'
- 'Delphinus (Grampus) was reranked as Grampus and belongs to Delphinidae'
- 'Delphinus (Grampus) acutus is recombined as Lagenorhynchus acutus'
- 'Delphinus (Grampus) heavisidii is recombined as Delphinus heavisidii'
- 'Delphinus abusalam belongs to Delphinus'
- 'Delphinus albirostris is recombined as Lagenorhynchus albirostris'
- 'Delphinus alope belongs to Delphinus'
- 'Delphinus blainvillei is recombined as Pontoporia blainvillii'
- 'Delphinus clymene belongs to Delphinus'
- 'Delphinus coeruleoalbus is recombined as Lagenorhynchus caeruleoalbus'
- 'Delphinus compressus is recombined as Steno compressus'
- 'Delphinus cymodoce belongs to Delphinus'
- 'Delphinus delphis belongs to Delphinus'
- 'Delphinus desmarestii is recombined as Hyperoodon desmarestii'
- 'Delphinus doris belongs to Delphinus'
- 'Delphinus dubius belongs to Delphinus'
- 'Delphinus euphrosyne belongs to Delphinus'
- 'Delphinus eurynome belongs to Delphinus'
- 'Delphinus eutropia belongs to Delphinus'
- 'Delphinus forsteri belongs to Delphinus'
- 'Delphinus frenatus belongs to Delphinus'
- 'Delphinus frontatus is recombined as Steno frontatus'
- 'Delphinus gangeticus is recombined as Platanista gangetica'
- 'Delphinus geoffrensis is recombined as Inia geoffroyii'
- 'Delphinus intermedius is recombined as Orca intermedia'
- 'Delphinus janira belongs to Delphinus'
- 'Delphinus kingii is recombined as Beluga kingii'
- 'Delphinus leucopleurus is recombined as Lagenorhynchus leucopleurus'
- 'Delphinus longirostris belongs to Delphinus'
- 'Delphinus loriger belongs to Delphinus' according to Wiegmann 1841
- 'Delphinus loriger belongs to Delphinus'
- 'Delphinus malayanus is recombined as Steno malayanus'
- 'Delphinus metis belongs to Delphinus'
- 'Delphinus microbrachium belongs to Delphinus'
- 'Delphinus microps belongs to Delphinus'
- 'Delphinus micropterus is recombined as Delphinorhynchus micropterus'
- 'Delphinus novaezelandiae belongs to Delphinus'
- 'Delphinus obscurus belongs to Delphinus'
- 'Delphinus peronii is recombined as Delphinapterus peronii'
- 'Delphinus phocaenoides is recombined as Neomeris phocaenoides'
- 'Delphinus rissoanus is recombined as Grampus rissoanus'
- 'Delphinus rostratus is recombined as Steno rostratus'
- 'Delphinus sao belongs to Delphinus'
- 'Delphinus sowerbiensis is recombined as Ziphius sowerbiensis'
- 'Delphinus styx belongs to Delphinus'
- 'Delphinus tursio belongs to Delphinus'
- 'Globicephala sieboldii is recombined as Globiocephalus sieboldii'
- 'Globicephalus macrorhynchus is recombined as Globiocephalus macrorhynchus'
- 'Globicephalus svineval is recombined as Globiocephalus svineval'
- 'Globiocephalus belongs to Delphinidae'
- 'Globiocephalus affinis belongs to Globiocephalus'
- 'Grampus cuvieri belongs to Grampus'
- 'Grampus richardsonii belongs to Grampus'
- 'Grampus sakamata belongs to Grampus'
- 'Halicore belongs to Manatidae'
- 'Halicore australis belongs to Halicore'
- 'Halicore tabernaculi belongs to Halicore'
- 'Hyperoodon belongs to Delphinidae'
- 'Hyperoodon butskopf is corrected as Hyperoodon butzkopf and belongs to Hyperoodon'
- 'Hyperoodon doumetii belongs to Hyperoodon'
- 'Hyperoodon latifrons belongs to Hyperoodon'
- 'Hyperoodon rostratum belongs to Hyperoodon'
- 'Inia belongs to Delphinidae'
- 'Kogia belongs to Catodontidae'
- 'Lagenorhynchus belongs to Delphinidae'
- 'Lagenorhynchus asia belongs to Lagenorhynchus'
- 'Lagenorhynchus clanculus belongs to Lagenorhynchus'
- 'Lagenorhynchus electra belongs to Lagenorhynchus'
- 'Lagenorhynchus thicolea belongs to Lagenorhynchus'
- 'Manati gigas is recombined as Rytina gigas'
- 'Manatidae belongs to Sirenia'
- 'Manatus belongs to Manatidae'
- 'Manatus australis belongs to Manatus'
- 'Manatus senegalensis belongs to Manatus'
- 'Megaptera belongs to Balaenidae'
- 'Megaptera americana belongs to Megaptera'
- 'Megaptera kuzira belongs to Megaptera'
- 'Megaptera poeskop belongs to Megaptera'
- 'Monodon belongs to Delphinidae'
- 'Monodon monoceros belongs to Monodon'
- 'Neomeris belongs to Delphinidae'
- 'Orca belongs to Delphinidae'
- 'Orca capensis belongs to Orca'
- 'Orca gladiator belongs to Orca'
- 'Phocaena belongs to Delphinidae'
- 'Phocaena communis belongs to Phocaena'
- 'Phocaena crassidens is recombined as Orca crassidens'
- 'Phocoena compressicauda is recombined as Delphinus compressicauda'
- 'Physalus belongs to Balaenidae'
- 'Physalus fasciatus belongs to Physalus'
- 'Physeter belongs to Catodontidae'
- 'Physeter breviceps is recombined as Kogia breviceps'
- 'Physeter macrocephalus is recombined as Catodon macrocephalus'
- 'Physeter polycyphus belongs to Physeter' according to Quoy and Gaimard 1824
- 'Physeter polycyphus is recombined as Catodon polycyphus'
- 'Physeter tursio belongs to Physeter'
- 'Platanista belongs to Delphinidae'
- 'Pontoporia belongs to Delphinidae'
- 'Rorqualus was reranked as Physalus (Rorqualus) and belongs to Physalus'
- 'Rorqualus boops is recombined as Physalus (Rorqualus) boops' according to J. E. Gray 1847
- 'Rytina belongs to Manatidae'
- 'Sirenia was reranked as a suborder and belongs to Cete'
- 'Steno belongs to Delphinidae'
- 'Steno attenuatus belongs to Steno'
- 'Steno fuscus belongs to Steno'
- 'Trichechus dugon is recombined as Halicore dugong'
- 'Ziphius belongs to Delphinidae'
- 'Ziphius sechellensis belongs to Ziphius'