Opinions from M. E. Steeman 2007
- 'Aetiocetidae belongs to Mysticeti'
- 'Aetiocetus belongs to Aetiocetidae'
- 'Aglaocetidae belongs to Balaenopteroidea'
- 'Aglaocetus belongs to Aglaocetidae'
- 'Amphicetus belongs to Diorocetidae'
- 'Balaena belongs to Balaenidae'
- 'Balaenoidea belongs to Chaeomysticeti'
- 'Balaenoptera belongs to Balaenopteridae'
- 'Balaenopteridae belongs to Balaenopteroidea'
- 'Balaenopteroidea belongs to Chaeomysticeti'
- 'Balanadae is corrected as Balaenidae and belongs to Balaenoidea'
- 'Caperea belongs to Neobalaenidae'
- 'Cephalotropis belongs to Herpetocetinae'
- 'Cetotheriinae was reranked as the family Cetotheriidae and belongs to Cetotherioidea'
- 'Cetotherioidea belongs to Chaeomysticeti'
- 'Cetotheriopsinae was reranked as the family Cetotheriopsidae and belongs to Eomysticetoidea'
- 'Cetotheriopsis belongs to Cetotheriopsidae'
- 'Cetotherium belongs to Cetotheriidae'
- 'Cetotherium megalophysum is an invalid subgroup of Cetotherioidea'
- 'Chaeomysticeti belongs to Mysticeti'
- 'Chonecetus belongs to Aetiocetidae'
- 'Cophocetus belongs to Pelocetidae'
- 'Diorocetidae belongs to Balaenopteroidea'
- 'Diorocetus belongs to Diorocetidae'
- 'Eomysticetidae belongs to Eomysticetoidea'
- 'Eomysticetoidea belongs to Chaeomysticeti'
- 'Eomysticetus belongs to Eomysticetidae'
- 'Eschrichtiidae belongs to Cetotherioidea'
- 'Eubalaena belongs to Balaenidae'
- 'Halicetus belongs to Pelocetidae'
- 'Herpetocetinae belongs to Cetotheriidae'
- 'Herpetocetus belongs to Herpetocetinae'
- 'Isanacetus belongs to Aglaocetidae'
- 'Llanocetidae belongs to Mysticeti'
- 'Llanocetus belongs to Llanocetidae'
- 'Mammalodon belongs to Mysticeti'
- 'Mauicetus belongs to Balaenopteroidea'
- 'Mauicetus lophocephalus is an invalid subgroup of Eomysticetoidea'
- 'Mauicetus waitakiensis is an invalid subgroup of Eomysticetoidea'
- 'Megaptera belongs to Balaenopteridae'
- 'Megaptera (Eschrichtius) was reranked as Eschrichtius and belongs to Eschrichtiidae'
- 'Mesocetus argillarius is an invalid subgroup of Cetotherioidea'
- 'Metopocetus belongs to Herpetocetinae'
- 'Micromysticetus belongs to Cetotheriopsidae'
- 'Mixocetus belongs to Cetotherioidea'
- 'Morenocetus belongs to Balaenidae'
- 'Mysticeti belongs to Cetacea'
- 'Nannocetus belongs to Herpetocetinae'
- 'Neobalaenidae belongs to Balaenoidea'
- 'Parietobalaena belongs to Pelocetidae'
- 'Pelocetidae belongs to Balaenopteroidea'
- 'Pelocetus belongs to Pelocetidae'
- 'Pinocetus belongs to Aglaocetidae'
- 'Piscobalaena belongs to Cetotheriidae'
- 'Plesiocetus belongs to Diorocetidae'
- 'Thinocetus belongs to Diorocetidae'