Ctenorhachis information

Ctenorhachis; Temporal range: Early Permian, 290.1–279.3 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Synapsida
Order:	†Pelycosauria
Family:	†Sphenacodontidae
Genus:	†Ctenorhachis ; Hook & Hotton, 1991
Binomial name
	†Ctenorhachis jacksoni; Hook & Hotton, 1991

Ctenorhachis (Greek for "comb spine") is an extinct genus of the family Sphenacodontidae.^[1] Ctenorhachis lived in the Early Permian epoch. Ctenorhachis was related to Dimetrodon, but did not belong to the same subfamily as Dimetrodon and Sphenacodon, being a more basal member of Sphenacodontidae. Two specimens are known that have been found from the Wichita Group outcropping in Baylor and Archer counties, north-central Texas. Only the vertebrae and pelvis are known. Articulated vertebrae from the holotype specimen possess blade like neural spines that are greatly enlarged, although not nearly to the extent that can be seen in more derived sphenacodontids such as Dimetrodon and Secodontosaurus, in which they form a large sail. The pelvis is nearly identical to that of Dimetrodon. As suggested in the original description of the genus, Ctenorhachis may represent a short-spined sexual dimorph, although the authors find this unlikely.^[2]

^ Benson, R.J. (2012). "Interrelationships of basal synapsids: cranial and postcranial morphological partitions suggest different topologies". Journal of Systematic Palaeontology. 10 (4): 601–624. doi:10.1080/14772019.2011.631042. S2CID 84706899.
^ Hook, R. W. and N. Hotton (1991). A New Sphenacodontid Pelycosaur (Synapsida) from the Wichita Group, Lower Permian of North-Central Texas. Journal of Vertebrate Paleontology 11(1):37-44.

[BRJ12-1] Benson, R.J. (2012). "Interrelationships of basal synapsids: cranial and postcranial morphological partitions suggest different topologies". Journal of Systematic Palaeontology. 10 (4): 601–624. doi:10.1080/14772019.2011.631042. S2CID 84706899.

[2] Hook, R. W. and N. Hotton (1991). A New Sphenacodontid Pelycosaur (Synapsida) from the Wichita Group, Lower Permian of North-Central Texas. Journal of Vertebrate Paleontology 11(1):37-44.

Ctenorhachis information

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Ctenorhachis

Sphenacodontidae

Dimetrodon

Therapsida

Edaphosauridae

Sphenacodontia

Caseasauria

Eupelycosauria

Archaeothyris

Edaphosaurus

Melanedaphodon

Cotylorhynchus

Theriodontia

Ophiacodon

Varanopidae

Neosaurus

Secodontosaurus

Eutheriodontia

Mesenosaurus

Sphenacodontoidea

Nocona Formation

Caseidae

Eunotosaurus

Dimetrodon borealis

Sphenacodon

Ennatosaurus

Watongia

Mnemeiosaurus

Ophiacodontidae