Opinions from J. F. Brandt 1873
- 'Aulacodelphis is a nomen nudum'
- 'Balaena belongs to Balaenidae'
- 'Rorqualus cortesii is a subjective synonym of Cetotherium (Cetotheriophanes) capellinii'
- 'Balaena cuvierii is recombined as Cetotherium (Cetotheriophanes) cuvierii'
- 'Balaenodon lintianus is recombined as Cetotheriopsis linziana'
- 'Balaenoptera belongs to Balaenopterinae'
- 'Burtinopsis belongs to Cetotheriinae'
- 'Caperea is a subjective synonym of Balaena'
- 'Cetotheriinae belongs to Balaenopteridae'
- 'Cetotheriomorphus belongs to Cetotheriinae'
- 'Cetotheriopsinae belongs to Balaenopteridae'
- 'Cetotheriopsis belongs to Cetotheriopsinae'
- 'Cetotherium belongs to Cetotheriinae'
- 'Cetotherium (Cetotheriophanes) belongs to Cetotherium'
- 'Cetotherium (Cetotheriophanes) capellinii belongs to Cetotherium (Cetotheriophanes)'
- 'Cetotherium (Cetotheriophanes) cuvieri belongs to Cetotherium (Cetotheriophanes)'
- 'Cetotherium (Eucetotherium) belongs to Cetotherium'
- 'Cetotherium (Plesiocetopsis) belongs to Cetotherium'
- 'Cetotherium ambiguum belongs to Cetotherium'
- 'Cetotherium brevifrons is recombined as Cetotherium (Plesiocetopsis) brevifrons'
- 'Cetotherium cortesi belongs to Cetotherium'
- 'Cetotherium dubium is recombined as Cetotherium (Plesiocetopsis) dubium'
- 'Cetotherium incertum belongs to Cetotherium'
- 'Cetotherium klinderi belongs to Cetotherium'
- 'Cetotherium mayeri belongs to Cetotherium'
- 'Cetotherium rathkii belongs to Cetotherium'
- 'Cetotherium vandelli is recombined as Cetotherium (Cetotheriophanes) vandelli'
- 'Champsodelphis dubius belongs to Champsodelphis'
- 'Champsodelphis fuchsii belongs to Champsodelphis'
- 'Champsodelphis karreri belongs to Champsodelphis'
- 'Champsodelphis letochae belongs to Champsodelphis'
- 'Champsodelphis macrognathus belongs to Champsodelphis'
- 'Champsodelphis valenciennesii belongs to Champsodelphis'
- 'Delphinapterus belongs to Leucodelphini'
- 'Delphinapterus (Hemisyntrachelus) belongs to Delphinapterus'
- 'Delphinapterus (Pachypleurus) belongs to Delphinapterus'
- 'Delphinapterus (Pachypleurus) fockii belongs to Delphinapterus (Pachypleurus)'
- 'Delphinapterus (Pachypleurus) nordmanni belongs to Delphinapterus (Pachypleurus)'
- 'Delphinus acutidens is replaced by Orca meyeri'
- 'Delphinus brachyspondylus belongs to Delphinus'
- 'Delphinus brocchi is recombined as Delphinapterus (Hemisyntrachelus) brochii'
- 'Delphinus cortesii is recombined as Delphinapterus (Hemisyntrachelus) cortesii'
- 'Delphinus dationum belongs to Delphinus'
- 'Delphinus karsteni is recombined as Globiceps karstenii'
- 'Delphinus karsteni is recombined as Delphinorhynchus karsteni' according to Laurillard 1841
- 'Delphinus renovi [misspelled as Delphinus renoui] belongs to Delphinus'
- 'Eubalaena is a subjective synonym of Balaena'
- 'Eucetus belongs to Physeterinae'
- 'Heterodelphis klinderi belongs to Heterodelphis'
- 'Holodontidae belongs to Odontoceti'
- 'Homaeocetus belongs to Physeterinae'
- 'Hoplocetus belongs to Physeterinae'
- 'Hunterius is a subjective synonym of Balaena'
- 'Hunterius svendenborgii is recombined as Balaena svendenborgii'
- 'Hunterius svendenborgii belongs to Hunterius' according to Lilljeborg 1868
- 'Kyphobalaena belongs to Balaenopterinae'
- 'Leucodelphini belongs to Phocoeninae'
- 'Macleayius is a subjective synonym of Balaena'
- 'Megaptera is a subjective synonym of Kyphobalaena'
- 'Monodon belongs to Leucodelphini'
- 'Monodon monoceros belongs to Monodon'
- 'Orca meyeri belongs to Orca'
- 'Orcini was reranked as the subfamily Orcinae and belongs to Holodontidae'
- 'Pachyacanthus belongs to Cetotheriinae'
- 'Pachyacanthus letochae belongs to Pachyacanthus'
- 'Pachyacanthus trachyspondylus belongs to Pachyacanthus'
- 'Pachyodon catulli is recombined as Squalodon catulli'
- 'Pachyspondylus belongs to Cetacea'
- 'Palaeocetus belongs to Balaenidae'
- 'Phoca melitensis is recombined as Squalodon melitensis'
- 'Phocodon scillae is recombined as Squalodon scillae'
- 'Physeter belongs to Physeterinae'
- 'Physeter physaloides belongs to Physeter'
- 'Physodon belongs to Physeterinae'
- 'Physodon leccense belongs to Physodon' according to P. Gervais 1872
- 'Plesiocetus belongs to Cetotheriinae'
- 'Plesiocetus burtinii is recombined as Cetotherium (Plesiocetopsis) burtinii'
- 'Plesiocetus gervaisii is recombined as Cetotherium (Plesiocetopsis) gervaisii'
- 'Plesiocetus hupschii is recombined as Cetotherium (Plesiocetopsis) hupschii'
- 'Protobalaena is a subjective synonym of Balaena'
- 'Pterobalaena is a subjective synonym of Balaenoptera'
- 'Rhizoprion bariensis is a subjective synonym of Squalodon grateloupii'
- 'Squalodon gastaldii belongs to Squalodon'
- 'Squalodon meyeri belongs to Squalodon'
- 'Squalodon suessii belongs to Squalodon'
- 'Stegorhinidae belongs to Archaeoceti'
- 'Zeuglodon paulsonii belongs to Zeuglodon'
- 'Zeuglodon puschii belongs to Zeuglodon'
- 'Ziphius blasii belongs to Ziphius'
- 'Ziphius priscus is recombined as Cetotherium priscum'
- 'Ziphius priscus is recombined as Choneziphius priscus' according to Eichwald 1860