Opinions from O. Abel 1901
- 'Balaena primigenius belongs to Balaena'
- 'Balaenotus insignis belongs to Balaenotus'
- 'Cetotherium brevifrons is recombined as Heterocetus brevifrons'
- 'Cetotherium dubium is recombined as Heterocetus dubius'
- 'Cyrtodelphis belongs to Argyrocetinae'
- 'Delphinorhynchus desalles is a subjective synonym of Cyrtodelphis sulcatus'
- 'Schizodelphis canaliculatus is a subjective synonym of Cyrtodelphis sulcatus'
- 'Champsodelphis dationum is a subjective synonym of Cyrtodelphis sulcatus'
- 'Delphinus delannoy belongs to Delphinus'
- 'Delphinus dewaeli belongs to Delphinus'
- 'Delphinus planus is a subjective synonym of Cyrtodelphis sulcatus'
- 'Delphinus pseudodelphis is a subjective synonym of Stenella attenuata'
- 'Delphinus pseudodelphis is a subjective synonym of Cyrtodelphis sulcatus'
- 'Delphinus sulcatus is recombined as Cyrtodelphis sulcatus'
- 'Delphinus wasii belongs to Delphinus'
- 'Eurhinodelphis ambiguus belongs to Eurhinodelphis'
- 'Eurhinodelphis cocheteuxi belongs to Eurhinodelphis'
- 'Eurhinodelphis longirostris belongs to Eurhinodelphis'
- 'Heterocetus affinis belongs to Heterocetus'
- 'Heterocetus scriptus belongs to Heterocetus'
- 'Megapteropsis robusta belongs to Megapteropsis'
- 'Plesiocetus brialmonti is recombined as Balaena brialmonti'
- 'Plesiocetus burtinii [misspelled as Heterocetus burtini] belongs to Heterocetus'
- 'Plesiocetus giganteus belongs to Plesiocetus'
- 'Plesiocetus hupschii is recombined as Heterocetus hupschii'
- 'Plesiocetus intermedius belongs to Plesiocetus'
- 'Plesiocetus minor belongs to Plesiocetus'
- 'Plesiocetus rostratus belongs to Plesiocetus'
- 'Plesiocetus tertius belongs to Plesiocetus'
- 'Pontoplanodes is a subjective synonym of Saurodelphis'
- 'Priscodelphinus crassus is a subjective synonym of Eurhinodelphis cocheteuxi'
- 'Priscodelphinus declivus is a subjective synonym of Eurhinodelphis cocheteuxi'
- 'Priscodelphinus productus belongs to Priscodelphinus'
- 'Priscodelphinus robustus is a subjective synonym of Eurhinodelphis cocheteuxi'
- 'Priscodelphinus teres is a subjective synonym of Eurhinodelphis cocheteuxi'
- 'Priscodelphinus validus is a subjective synonym of Eurhinodelphis cocheteuxi'
- 'Probalaena dubusii belongs to Probalaena'
- 'Protobalaena is corrected as Probalaena and belongs to Mysticeti'
- 'Saurocetes is a subjective synonym of Saurodelphis'
- 'Saurocetes argentinus is recombined as Saurodelphis argentinus'
- 'Schizodelphis depereti is a subjective synonym of Cyrtodelphis sulcatus'
- 'Ziphiola belongs to Ziphiidae'