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	Captorhinus magnus skull Skull of Captorhinus magnus with labelled bones (after Reisz et al. 2011)
	Captorhinus magnus, a member of the Captorhinidae family, dates from the Late  Pennsylvanian and Early Permian periods. Captorhinus magnus was identified from the Richards Spur locality in Oklahoma, a site that also produced the remains of C. aguti. Fossils of C. magnus are found mainly in deeper strata,  suggesting igts replacement by the smaller C. aguti during the Early Permian. Captorhinus magnus averaged about twice as large as C. aguti. Another important difference between the two species is that the teeth of C. magnus are arranged in a single row while C. aguti has multiple rows. There are also developmental differences in the femur.  Otherwise, except for size the two species are virtually identical in form.                 Reference: Reisz, Robert R.; Jin Liu, Jin-Ling Li, and Johannes Muller 2011 .
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