Opinions from M. Steeman 2010
- 'Aglaocetidae belongs to Balaenopteroidea'
- 'Aglaocetus belongs to Aglaocetidae'
- 'Aglaocetus patulus belongs to Aglaocetus'
- 'Amphicetus belongs to Diorocetidae'
- 'Amphicetus editus is a nomen dubium'
- 'Amphicetus later belongs to Amphicetus'
- 'Amphicetus rotundus is recombined as Aglaocetus rotundus'
- 'Amphicetus verus is a nomen dubium'
- 'Balaenoidea belongs to Chaeomysticeti'
- 'Balaenoptera musculoides is a subjective synonym of Plesiocetus garopii'
- 'Balaenopteridae belongs to Balaenopteroidea'
- 'Balaenopteroidea belongs to Chaeomysticeti'
- 'Burtinopsis is a nomen dubium'
- 'Burtinopsis minutus is a nomen dubium'
- 'Burtinopsis similis is a nomen dubium'
- 'Cetotheriinae was reranked as the family Cetotheriidae and belongs to Cetotherioidea'
- 'Cetotherioidea belongs to Chaeomysticeti'
- 'Cetotherium (Plesiocetopsis) was reranked as Plesiocetopsis and belongs to Diorocetidae'
- 'Heterocetus brevifrons is a nomen dubium'
- 'Plesiocetus dubius is a nomen dubium'
- 'Cetotherium moreni is recombined as Aglaocetus moreni'
- 'Chaeomysticeti belongs to Mysticeti'
- 'Diorocetidae belongs to Balaenopteroidea'
- 'Herpetocetinae belongs to Cetotheriidae'
- 'Herpetocetus belongs to Herpetocetinae'
- 'Herpetocetus bramblei belongs to Herpetocetus'
- 'Herpetocetus scaldiensis belongs to Herpetocetus'
- 'Herpetocetus transatlanticus belongs to Herpetocetus'
- 'Heterocetus is a nomen dubium'
- 'Heterocetus affinis is recombined as Parietobalaena affinis'
- 'Heterocetus guiscardii is a nomen dubium'
- 'Heterocetus sprangii is a nomen dubium'
- 'Idiocetus belongs to Balaenidae'
- 'Idiocetus guicciardinii belongs to Idiocetus'
- 'Idiocetus longifrons is recombined as Aglaocetus longifrons'
- 'Idiocetus tsugarensis is a nomen dubium'
- 'Isocetus is a nomen dubium'
- 'Isocetus depauwii is a nomen dubium'
- 'Mesocetus is a nomen dubium'
- 'Mesocetus argillarius is an invalid subgroup of Cetotherioidea'
- 'Mesocetus latifrons is recombined as Aglaocetus latifrons'
- 'Mesocetus laxatus is recombined as Parietobalaena laxata'
- 'Mesocetus longirostris is a nomen dubium'
- 'Mesocetus pinguis is a nomen dubium'
- 'Mysticeti belongs to Neoceti'
- 'Neoceti belongs to Pelagiceti'
- 'Parietobalaena belongs to Pelocetidae'
- 'Parietobalaena palmeri belongs to Parietobalaena'
- 'Pelagiceti belongs to Cetacea'
- 'Pelocetidae belongs to Balaenopteroidea'
- 'Plesiocetus belongs to Balaenopteridae'
- 'Plesiocetus brialmontii is a nomen dubium'
- 'Plesiocetus burtinii is recombined as Aglaocetus burtinii'
- 'Plesiocetus garopii belongs to Plesiocetus'
- 'Plesiocetus hupschii is recombined as Plesiocetopsis hupschii'