Opinions from O. Abel 1914
- 'Acrodelphidae is corrected as Acrodelphinidae and belongs to Squaloceti'
- 'Agorophiidae belongs to Archaeoceti'
- 'Agorophius belongs to Agorophiidae'
- 'Agriocetus belongs to Patriocetidae'
- 'Cetotheriopsis linziana is a subjective synonym of Patriocetus denggi'
- 'Balaenopteridae belongs to Mystacoceti'
- 'Balanadae is corrected as Balaenidae and belongs to Mystacoceti'
- 'Delphinidae belongs to Delphinoceti'
- 'Delphinoceti belongs to Cetacea'
- 'Dorudon serratus is recombined as Zeuglodon serratum'
- 'Eocetus belongs to Zeuglodontidae'
- 'Eurhinodelphidae belongs to Squaloceti'
- 'Kekenodon belongs to Zeuglodontidae'
- 'Kekenodon onamata [misspelled as Kekenodon onomata] belongs to Kekenodon'
- 'Mesocetus schweinfurthi is recombined as Eocetus schweinfurthi'
- 'Microzeuglodon belongs to Microzeuglodontidae'
- 'Microzeuglodontidae belongs to Archaeoceti'
- 'Mystacoceti belongs to Cetacea'
- 'Patriocetidae belongs to Archaeoceti'
- 'Patriocetus belongs to Patriocetidae'
- 'Patriocetus denggi belongs to Patriocetus'
- 'Phocaenina was reranked as the family Phocaenidae and belongs to Delphinoceti'
- 'Phococetus belongs to Zeuglodontidae'
- 'Physeteridae belongs to Squaloceti'
- 'Platanistina was reranked as the family Platanistidae and belongs to Squaloceti'
- 'Prosqualodon belongs to Agorophiidae'
- 'Prosqualodon australis [misspelled as Prosqualodon australe] belongs to Prosqualodon'
- 'Protocetidae belongs to Archaeoceti'
- 'Protocetus belongs to Zeuglodontidae'
- 'Protocetus atavus belongs to Protocetus'
- 'Prozeuglodon belongs to Zeuglodontidae'
- 'Prozeuglodon atrox belongs to Prozeuglodon'
- 'Rhachianectidae belongs to Mystacoceti'
- 'Squaloceti belongs to Cetacea'
- 'Squalodon ehrlichii is recombined as Patriocetus ehrlichi'
- 'Squalodon incertus is replaced by Agriocetus austriacus'
- 'Squalodon linzianus is a subjective synonym of Patriocetus ehrlichi'
- 'Squalodontidae belongs to Squaloceti'
- 'Zeuglodon belongs to Zeuglodontidae'
- 'Zeuglodon brachyspondylum belongs to Zeuglodon'
- 'Zeuglodon brachyspondylus minor is recombined as Zygorhiza minor'
- 'Zeuglodon caucasicus is recombined as Microzeuglodon caucasicum'
- 'Zeuglodon cetoides belongs to Zeuglodon'
- 'Zeuglodon harwoodii is recombined as Microzeuglodon harwoodi'
- 'Zeuglodon isis belongs to Zeuglodon'
- 'Zeuglodon osiris belongs to Zeuglodon'
- 'Zeuglodon puschii is a nomen dubium'
- 'Zeuglodon pygmaeus is recombined as Agorophius pygmaeus'
- 'Zeuglodon rossicus is corrected as Zeuglodon rossicum and belongs to Zeuglodon'
- 'Zeuglodon vasconum is recombined as Phococetus vasconum'
- 'Zeuglodon wanklyni belongs to Zeuglodon'
- 'Zeuglodon zitteli belongs to Zeuglodon'
- 'Zeuglodontidae belongs to Archaeoceti'
- 'Ziphiidae belongs to Squaloceti'
- 'Zygorhiza belongs to Zeuglodontidae'