Opinions from K. A. Zittel 1894
- 'Archaeoceti belongs to Cetacea'
- 'Arionius is a subjective synonym of Squalodon'
- 'Arionius servatus is recombined as Squalodon servatus'
- 'Basilosaurus is a subjective synonym of Zeuglodon'
- 'Champsodelphis belongs to Platanistidae'
- 'Colophonodon is a subjective synonym of Squalodon'
- 'Colophonodon holmesii is recombined as Squalodon holmesii'
- 'Crenidelphinus is a subjective synonym of Squalodon'
- 'Cynorca is a subjective synonym of Squalodon'
- 'Cynorca proterva is recombined as Squalodon protervus'
- 'Delphinodon is a subjective synonym of Squalodon'
- 'Delphinoides is a subjective synonym of Squalodon'
- 'Delphinus brachyspondylus is recombined as Macrochirifer brachyspondylus'
- 'Delphinus macrogenius is recombined as Champsodelphis macrogenius'
- 'Doryodon is a misspelling of Dorudon'
- 'Dorudon is a subjective synonym of Zeuglodon'
- 'Hydrarchos is a subjective synonym of Zeuglodon'
- 'Kekenodon [misspelled as Kenodon] belongs to Basilosauridae'
- 'Kekenodon onamata [misspelled as Kenodon onamata] belongs to Kenodon'
- 'Macrophoca is a subjective synonym of Squalodon'
- 'Macrophoca atlantica is recombined as Squalodon atlanticus'
- 'Odontoceti belongs to Cetacea'
- 'Pachyacanthus is a subjective synonym of Champsodelphis'
- 'Pachyodon is a subjective synonym of Squalodon'
- 'Pachyodon catulli [misspelled as Squalodon catulloi] belongs to Squalodon'
- 'Phococetus is a subjective synonym of Squalodon'
- 'Phocodon is a subjective synonym of Squalodon'
- 'Platanistina was reranked as the family Platanistidae and belongs to Odontoceti'
- 'Pontobasileus is a subjective synonym of Zeuglodon'
- 'Pontogeneus is a subjective synonym of Zeuglodon'
- 'Portheodon is a subjective synonym of Squalodon'
- 'Rhizoprion is a subjective synonym of Squalodon'
- 'Smilocamptus is a subjective synonym of Squalodon'
- 'Squalodon belongs to Squalodontidae'
- 'Squalodon antverpiensis [misspelled as Squalodon antwerpiense] belongs to Squalodon'
- 'Squalodon ehrlichii is corrected as Squalodon ehrlichi and belongs to Squalodon'
- 'Squalodon gastaldii belongs to Squalodon'
- 'Squalodon grateloupii is corrected as Squalodon grateloupi and belongs to Squalodon'
- 'Squalodon incertus belongs to Squalodon'
- 'Squalodon pelagius belongs to Squalodon'
- 'Squalodon vocontiorum belongs to Squalodon'
- 'Squalodon wilkinsoni [misspelled as Squalodon ckinsoni] belongs to Squalodon'
- 'Squalodontidae belongs to Odontoceti'
- 'Stereodelphis is a subjective synonym of Squalodon'
- 'Trirhizodon is a subjective synonym of Squalodon'
- 'Zeuglodon belongs to Zeuglodontidae'
- 'Zeuglodon paulsonii [misspelled as Zeuglodon paulsoni] belongs to Zeuglodon'
- 'Zeuglodon vasconum belongs to Zeuglodon'
- 'Zeuglodon vredense belongs to Zeuglodon'
- 'Zeuglodon wanklyni belongs to Zeuglodon'
- 'Zeuglodontidae belongs to Archaeoceti'