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<div>{{italictitle}}{{Automatic taxobox<br />
| name = ''Sphenacodon''<br />
| fossil_range = [[Cisuralian]], {{fossilrange|299|270.6}}<br />
| image = Sphenacodon ferox 2.jpg<br />
| image_width = 250px<br />
| image_caption = Skeleton of ''Sphenacodon ferox'' in the [[Field Museum of Natural History]].<br />
| parent_authority = [[Othniel Charles Marsh|Marsh]], 1878<br />
| subdivision_ranks = Species<br />
| subdivision = <br />
* ''Sphenacodon britannicus'' <small> (Huene, 1908) </small><br />
* ''Sphenacodon ferox'' <small> Marsh, 1878 </small><br />
* ''Sphenacodon ferocior'' <small> Romer, 1937 </small><br />
}}<br />
<br />
'''''Sphenacodon''''' was a [[pelycosaur]] that was about {{convert|3|m|ft}} in length. ''Sphenacodon'' belongs to the family [[Sphenacodontidae]], a lineage that was related to the [[therapsid]]s. It lived in the Early [[Permian]] in present day [[Texas]] and [[New Mexico]].<br />
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''Sphenacodon'''s vertebral spines were long, and probably acted as attachment points for massive back muscles, allowing the animal to lunge powerfully at its prey. It was closely related to ''[[Dimetrodon]]'', but lacked the large "sail" of that animal. It had heavy jaws with powerful teeth, including long [[canine (tooth)|canine]]s and cutting cheek teeth, which indicate that it was probably carnivorous. <ref name=EoDP>{{cite book |editor=Palmer, D.|year=1999 |title= The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals|publisher= Marshall Editions|location=London|page= 187|isbn= 1-84028-152-9}}</ref><br />
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==Gallery==<br />
<gallery><br />
Image:Sphenacodon222.jpg|Restoration of ''Sphenacodon''.<br />
Image:Sphenac2.jpg|Second restoration of ''Sphenacodon''<br />
Image:Sphenacodon BW.jpg|Third restoration of ''Sphenacodon''<br />
Image:Sphenacodon2.jpg|Pair of ''Sphenacodon''.<br />
Image:Sphenacodon ferox 1.jpg|Skull of ''S. ferox'' in the Field Museum.<br />
</gallery><br />
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==See also==<br />
* [[List of synapsids]]<br />
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* ''[[Edaphosaurus]]''<br />
* ''[[Haptodus]]''<br />
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==References==<br />
{{reflist}}<br />
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[[Category:Sphenacodonts]]<br />
[[Category:Permian synapsids]]<br />
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{{Basal synapsids}}<br />
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{{synapsid-stub}}<br />
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{{portal|Paleontology}}<br />
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[[zh:楔齒龍]]</div>ExplosionRadiative