Ctenorhachis (Greek for "comb spine") is an extinct genus of the family Sphenacodontidae. 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
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Ctenorhachis (« l'épine de peigne » en grec) est un genre éteint de synapsides de la famille des Sphenacodontidae. Ses fossiles ont été découverts dans l'Artinskien (Permien inférieur) du Texas. Ctenorhachis a d'abord été relié à Dimetrodon, mais il n'appartient pas à la même sous-famille que Dimetrodon et Sphenacodon, étant un membre plus basal de Sphenacodontidae.
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