Opinions from F. -J. Pictet 1853
- 'Aodon is a subjective synonym of Dioplodon'
- 'Arionius belongs to Delphinidae'
- 'Arionius servatus belongs to Arionius'
- 'Balaena belongs to Balaenidae'
- 'Balaena cortesii is recombined as Rorqualus cortesii'
- 'Balaena cuvierii is recombined as Rorqualus cuvieri'
- 'Balaena lamanoni [misspelled as Balaena lamanonii] belongs to Balaena'
- 'Balaenodon belongs to Zeuglodontes'
- 'Balanadae is corrected as Balaenidae and belongs to Cetacea'
- 'Basilosaurus is a subjective synonym of Zeuglodon'
- 'Brachytaenius perennis belongs to Brachytaenius'
- 'Cetacea belongs to Monodelphia'
- 'Cetiosaurus brachyurus belongs to Cetiosaurus'
- 'Cetiosaurus brevis belongs to Cetiosaurus'
- 'Cetiosaurus conybeari is recombined as Pelorosaurus conybeari'
- 'Cetiosaurus longus belongs to Cetiosaurus'
- 'Cetiosaurus medius belongs to Cetiosaurus'
- 'Cetotherium belongs to Balaenidae'
- 'Cetotherium rathkii is corrected as Cetotherium rathkei and belongs to Cetotherium'
- 'Champsodelphis belongs to Delphinidae'
- 'Cheirotherium is a subjective synonym of Halitherium'
- 'Choneziphius belongs to Cetacea'
- 'Crenidelphinus is a subjective synonym of Squalodon'
- 'Deinotherium is corrected as Dinotherium and belongs to Sirenia'
- 'Delphinidae belongs to Cetacea'
- 'Delphinoides is a subjective synonym of Squalodon'
- 'Delphinus belongs to Delphinidae'
- 'Delphinus bordae is recombined as Champsodelphis bordae'
- 'Delphinus brevidens is recombined as Stereodelphis brevidens'
- 'Delphinus brocchi is corrected as Delphinus brocchii and belongs to Delphinus'
- 'Delphinus cortesii belongs to Delphinus'
- 'Delphinus dationum belongs to Delphinus'
- 'Delphinus karsteni [misspelled as Delphinus karsteinii] belongs to Delphinus'
- 'Delphinus macrogenius is recombined as Champsodelphis macrogenius'
- 'Delphinus molassicus is a subjective synonym of Arionius servatus'
- 'Delphinus pseudodelphis belongs to Delphinus'
- 'Delphinus renovi belongs to Delphinus'
- 'Delphinus vermontana is corrected as Delphinus vermontanus and belongs to Delphinus'
- 'Dinosauria was reranked as a unranked clade and belongs to Sauria'
- 'Diodon is a subjective synonym of Dioplodon'
- 'Dioplodon belongs to Cetacea'
- 'Dorudon is a subjective synonym of Zeuglodon'
- 'Dorydon is a misspelling of Dorudon'
- 'Engyommasaurus is a subjective synonym of Mystriosaurus'
- 'Fucotherium is a subjective synonym of Halitherium'
- 'Glaphyrorhynchus aalensis belongs to Glaphyrorhynchus' according to H. v. Meyer 1842
- 'Glaphyrorhynchus aalensis belongs to Glaphyrorhynchus'
- 'Gnathosaurus subulatus belongs to Gnathosaurus'
- 'Halianassa is a subjective synonym of Halitherium'
- 'Halicore belongs to Dugongidae'
- 'Halitherium belongs to Dugongidae'
- 'Hoplocetus belongs to Balaenidae'
- 'Hoplocetus crassidens belongs to Hoplocetus'
- 'Hydrarchus is a subjective synonym of Zeuglodon'
- 'Hylaeosaurus belongs to Dinosauria'
- 'Hylaeosaurus armatus belongs to Hylaeosaurus'
- 'Iguanodon belongs to Dinosauria'
- 'Iguanodon mantelli belongs to Iguanodon'
- 'Iguanosaurus is a subjective synonym of Iguanodon'
- 'Manatus belongs to Manatidae'
- 'Megalosaurus belongs to Dinosauria'
- 'Megalosaurus bucklandii [misspelled as Megalosaurus bucklandi] belongs to Megalosaurus'
- 'Megistosaurus belongs to Physeteridae'
- 'Mesodiodon is a subjective synonym of Dioplodon'
- 'Metaxytherium is a subjective synonym of Halitherium'
- 'Streptospondylus geoffroyi is a subjective synonym of Steneosaurus rostrominor'
- 'Monodon belongs to Monodontidae'
- 'Monodontidae belongs to Cetacea'
- 'Mystriosaurus egertoni is recombined as Teleosaurus egertoni'
- 'Mystriosaurus laurillardi belongs to Mystriosaurus'
- 'Mystriosaurus longipes is recombined as Teleosaurus longipes'
- 'Mystriosaurus mandelslohi is recombined as Teleosaurus mandelslohi'
- 'Mystriosaurus munsteri is recombined as Teleosaurus munsteri'
- 'Mystriosaurus schmidti is recombined as Teleosaurus schmidti'
- 'Mystriosaurus tiedmanni is recombined as Teleosaurus tiedemanni'
- 'Nodus is a subjective synonym of Dioplodon'
- 'Palaeosaurus is a subjective synonym of Aeolodon'
- 'Pelagosaurus typus belongs to Pelagosaurus'
- 'Pelorosaurus belongs to Dinosauria'
- 'Phocaena crassidens is recombined as Delphinus (Phocaena) crassidens'
- 'Phocodon is a subjective synonym of Squalodon'
- 'Physeter belongs to Physeteridae'
- 'Physeter antiquus belongs to Physeter'
- 'Physeter molassicus belongs to Physeter'
- 'Physeteridae belongs to Cetacea'
- 'Plateosaurus belongs to Dinosauria'
- 'Plateosaurus engelhardti belongs to Plateosaurus'
- 'Pontotherium is a subjective synonym of Halitherium'
- 'Pugmeodon is a subjective synonym of Halitherium'
- 'Regnosaurus belongs to Dinosauria'
- 'Regnosaurus northamptoni belongs to Regnosaurus'
- 'Rhytina belongs to Rhytinidae'
- 'Rorqualus belongs to Balaenidae'
- 'Smilocamptus is a misspelling of Smilocomptus'
- 'Smilocomptus burgueti [misspelled as Smilocamptus bourgueti] belongs to Smilocamptus'
- 'Squalodon belongs to Zeuglodontes'
- 'Squalodon grateloupii belongs to Squalodon'
- 'Steneosaurus rostrominor belongs to Steneosaurus'
- 'Stereodelphis belongs to Delphinidae'
- 'Teleosaurus cadomensis belongs to Teleosaurus'
- 'Teleosaurus chapmanni belongs to Teleosaurus'
- 'Teleosaurus minimus belongs to Teleosaurus'
- 'Therosaurus is a subjective synonym of Iguanodon'
- 'Trachytherium belongs to Dugongidae'
- 'Zeuglodon belongs to Zeuglodontes'
- 'Zeuglodontes belongs to Monodelphia'
- 'Ziphius belongs to Cetacea'
- 'Ziphius planirostris is recombined as Choneziphius planirostris'
- 'Zygodon is a subjective synonym of Zeuglodon'