Named By: Edward Drinker Cope 1895.
Synonyms:Bayloria, Eocaptorhinus, Hyponous, Hypopnous, Paracaptorhinus.
Classification: Chordata, Reptilia, Amniota, Captorhinida, Captorhinidae.
Species: C. aguti, C. kierani, C. laticeps, C. magnus.
Size: Up to 80 centimetres long.
Known locations: USA, Oklahoma, Texas.
Time period: Lower Permian.
Fossil representation: Known from hundreds of specimens.
The largest species of Captorhinus approaching eighty centimetres long is C. magnus, with other species around forty centimetres long. The other difference between the species is C. aguti which has more than one row of teeth. The arrangement of the teeth at the back of the mouth suggest that Captorhinus mashed plant leaves in its mouth before swallowing.
- Osteology and Relationships of Captorhinus aguti (Cope) (Reptilia: Captorhinomorpha). - The University of Kansas Paleontological Contributions, Series Vertebrata 11:1-79. - R. C. Fox & M. C. Bowman - 1966.
- Captorhinus vs. Hypopnous (Reptilia, Captorhinomorpha). - Journal of Paleontology 41(1):264-265. - D. Baird & R. L. Carroll - 1967.
- Captorhinus magnus, a new captorhinid (Amniota: Eureptilia) from the Lower Permian of Oklahoma, with new evidence on the homology of the astragalus. - Canadian Journal of Earth Sciences 39(9):1363-1372. - R. A. Kissel, D. W. Dilkes & R. R. Reisz - 2002.