Named By: R. W. Hook & N. Hotton - 1991.
Classification: Chordata, Synapsida, Pelycosauria, Sphenacodontidae.
Species: C. jacksoni (type).
Size: Uncertain due to lack of remains.
Known locations: USA, Texas - Wichita Group.
Time period: Early Permian.
Fossil representation: Partial post cranial remains, including vertebrae and pelvis.
Ctenorhachis is a genus of pelycosaur that lived in North America during the Permian. Although the skull of Ctenorhachis is unknown, the available fossil material for the genus show that Ctenorhachis was a sphenacodontid pelycosaur. So far all members of the Sphenacodontidae were predators in life, so by extension we can conclude that Ctenorhachis would have been a predator as well.
- A New Sphenacodontid Pelycosaur (Synapsida) from the Wichita Group, Lower Permian of North-Central Texas. - Journal of Vertebrate Paleontology 11(1):37-44. - R. W. Hook & N. Hotton - 1991.