Opinions from H. G. Bronn 1853
- 'Arionius belongs to Delphinidae'
- 'Arionius servatus belongs to Arionius'
- 'Balaenodon belongs to Balaenodontae'
- 'Balaenodon physaloides belongs to Balaenodon'
- 'Balaenodontae belongs to Cetacea'
- 'Balanadae is corrected as Balaenidae and belongs to Cetacea'
- 'Basilosaurus is a subjective synonym of Zeuglodon'
- 'Cetacea belongs to Mammalia'
- 'Cetotherium belongs to Balaenidae'
- 'Cetotherium rathkii [misspelled as Cetotherium rathkei] belongs to Cetotherium'
- 'Cheirotherium is a subjective synonym of Halitherium'
- 'Cheirotherium subapenninum is recombined as Halitherium subapenninum'
- 'Choneziphius [misspelled as Chonoziphius] belongs to Delphinidae'
- 'Crenidelphinus is a subjective synonym of Squalodon'
- 'Delphinidae belongs to Cetacea'
- 'Delphinoides is a subjective synonym of Squalodon'
- 'Basilosaurus squalodon is a subjective synonym of Squalodon grateloupi'
- 'Delphinopsis belongs to Delphinidae'
- 'Delphinopsis freyeri belongs to Delphinopsis'
- 'Delphinus cortesii is a subjective synonym of Arionius servatus'
- 'Delphinus molassicus is a subjective synonym of Arionius servatus'
- 'Dorudon is a subjective synonym of Basilosaurus'
- 'Dorudon serratus is a subjective synonym of Zeuglodon brachyspondylus'
- 'Fucotherium is a subjective synonym of Halitherium'
- 'Halianassa is a subjective synonym of Halitherium'
- 'Halicore cuvieri is a subjective synonym of Halitherium schinzi'
- 'Halitherium belongs to Herbivora'
- 'Halitherium serresii [misspelled as Halitherium serresi] belongs to Halitherium'
- 'Herbivorae [misspelled as Herbivora] belongs to Cetacea'
- 'Hippopotamus dubius is a subjective synonym of Halitherium schinzi'
- 'Hippopotamus intermedius is a subjective synonym of Halitherium cordieri'
- 'Hoplocetus belongs to Cetacea'
- 'Hoplocetus crassidens belongs to Hoplocetus'
- 'Hydrarchos harlani is a subjective synonym of Zeuglodon macrospondylus'
- 'Hydrarchus is a subjective synonym of Zeuglodon'
- 'Halianassa studeri is a subjective synonym of Halitherium schinzi'
- 'Metaxytherium is a subjective synonym of Halitherium'
- 'Metaxytherium cordieri is recombined as Halitherium cordieri'
- 'Pachyodon belongs to Zeuglodontae'
- 'Pachyodon mirabilis belongs to Pachyodon'
- 'Phocodon is a subjective synonym of Squalodon'
- 'Pontogeneus is a subjective synonym of Zeuglodon'
- 'Pontogeneus priscus is a subjective synonym of Zeuglodon pygmaeus'
- 'Pontotherium is a subjective synonym of Halitherium'
- 'Pugmeodon is a subjective synonym of Halitherium'
- 'Pugmeodon schinzii is recombined as Halitherium schinzi'
- 'Rhytina belongs to Herbivora'
- 'Sastrilophus dehmi belongs to Sastrilophus'
- 'Smilocomptus is corrected as Smilocamptus and belongs to Cetacea'
- 'Smilocomptus burgueti is recombined as Smilocamptus bourgueti'
- 'Squalodon belongs to Zeuglodontae'
- 'Squalodon grateloupii is corrected as Squalodon grateloupi and belongs to Squalodon'
- 'Trachytherium belongs to Herbivora'
- 'Trachytherium raulinii [misspelled as Trachytherium raulini] belongs to Trachytherium'
- 'Zeuglodon belongs to Cetacea'
- 'Zeuglodon brachyspondylus belongs to Zeuglodon'
- 'Zeuglodon cetoides is a subjective synonym of Zeuglodon macrospondylus'
- 'Zeuglodon hydrarchos is a subjective synonym of Zeuglodon brachyspondylus'
- 'Zeuglodon macrospondylus belongs to Zeuglodon'
- 'Zeuglodon pygmaeus belongs to Zeuglodon'
- 'Zeuglodontidae [misspelled as Zeuglodontae] belongs to Cetacea'
- 'Ziphius planirostris is recombined as Chonoziphius planirostris'
- 'Ziphius priscus is recombined as Cetotherium priscum'
- 'Zygodon is a subjective synonym of Zeuglodon'