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Ctenorhachis
''Ctenorhachis'' (Greek for "comb spine") is an extinct genus of the family Sphenacodontidae. ''Ctenorhachis'' was related to ''Dimetrodon'', but did not belong to the same subfamily as ''Dimetrodon'' and ''Sphenacodon'', being a more basal member of Sphenacodontidae. ''Ctenorhachis'' lived in the Early Permian epoch. 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 sphenacodontds 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.〔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.〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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