Fig. 5 in Morphology and evolutionary significance of the atlas-axis complex in varanopid synapsids

Fig. 5. Atlas−axis complexes of varanopid outgroups used in recent phylogenetic analyses (Botha−Brink and Modesto 2009; Campione and Reisz 2010). A. Atlas−axis complex of Archaeovenator hamiltonensis Reisz and Dilkes, 2003, Virgilian Series, Upper Pennsylvanian, Hamilton Quarry, Greenwood County, Kansas (modified from Reisz and Dilkes 2003). B. Cotylorhynchus romeri Stovall, 1937, Hennessey Formation, Permian, Logan County, Oklahoma (after Stovall et al. 1966). C. Ophiacodon retroversus Romer and Price, 1940, Admiral Formation, Wichita Group, Lower Permian, Wichita County, Texas (after Romer and Price 1940).