Opinions from E. Haeckel 1866
- 'Amniota belongs to Amphirrhina'
- 'Anamnia belongs to Amphirrhina'
- 'Anomodontia belongs to Rhamphosauria'
- 'Autoceta belongs to Cetacea'
- 'Aves belongs to Monocondylia'
- 'Belodon plieningeri belongs to Belodon'
- 'Chelonii is corrected as Chelonia and belongs to Rhamphosauria'
- 'Cladeiodon [misspelled as Cladyodon] belongs to Thecodonta'
- 'Cladeiodon lloydii [misspelled as Cladyodon lloydii] belongs to Cladyodon'
- 'Dichthacantha belongs to Tocosauria'
- 'Dicondylia belongs to Amniota'
- 'Dinosauria was reranked as a subclass and belongs to Reptilia'
- 'Harpagosauria belongs to Dinosauria'
- 'Hylaeosaurus belongs to Harpagosauria'
- 'Iguanodon belongs to Therosauria'
- 'Iguanodon mantelli belongs to Iguanodon'
- 'Lepidosauria belongs to Reptilia'
- 'Lissamphibia belongs to Amphibia'
- 'Mammalia belongs to Dicondylia'
- 'Megalosaurus belongs to Harpagosauria'
- 'Monocondylia belongs to Amniota'
- 'Monorrhina belongs to Pachycardia'
- 'Ornithurae belongs to Aves'
- 'Pachycardia belongs to Vertebrata'
- 'Palaeosaurus belongs to Thecodonta'
- 'Palaeosaurus cylindricum is corrected as Palaeosaurus cylindrodon and belongs to Palaeosaurus'
- 'Palaeosaurus platyodon belongs to Palaeosaurus'
- 'Pelorosaurus belongs to Harpagosauria'
- 'Phractamphibia belongs to Amphibia'
- 'Pisces belongs to Anamnia'
- 'Plateosaurus belongs to Harpagosauria'
- 'Pterosauria belongs to Rhamphosauria'
- 'Reptilia belongs to Monocondylia'
- 'Rhamphosauria belongs to Reptilia'
- 'Sauriurae belongs to Aves'
- 'Thecodontia [misspelled as Thecodonta] belongs to Tocosauria'
- 'Thecodontosaurus belongs to Thecodonta'
- 'Thecodontosaurus antiquus belongs to Thecodontosaurus'
- 'Therosauria belongs to Dinosauria'
- 'Tocosauria belongs to Reptilia'
- 'Vertebrata was reranked as a unranked clade and belongs to Animalia'
- 'Zeugloceta belongs to Cetacea'
- 'Zeuglodon belongs to Zeugloceta'