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opening is small and of oval shape. Also, because the cheek slants outward to very higher degree than is usual in pelycosaurs, the temporal opening is exposed in dorsal view. The premaxillae and nasals are short and the frontals are of moderate length. The supratemporal in Eothyris parkeyi is much more extremely developed than in any other pelycosaur. In Eothyris parkeyi, the postorbital bone is probably the largest for any synapsid,

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