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.
Q131809
Sphenacodontidae
Concept
Q130869
Dimetrodon
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Q1050408
Sphenacodon
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Q379061
basal
UNK
Q642169
Early Permian
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Q17380700
Wichita Group
LOC
Q108520
Baylor
LOC
Q108793
Archer
LOC
Q180323
vertebrae
Concept
Q713102
pelvis
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Q2397856
Secodontosaurus
Concept
Q1063077
Ctenorhachis
Concept
Q1063077
Ctenorhachis
Concept
Q1063077
Ctenorhachis
Concept
Q1063077
Ctenorhachis
Concept
parent taxon
location of discovery
location of discovery