The Dimetrodon Dilemma

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Dimetrodon was the apex terrestrial predator of the early to middle Permian. This genus is a “pelycosaur”-grade synapsid, and a member of Sphenacodontidae the most derived family of basal synapsids. This “sail”-backed ancestor of mammals is conventionally depicted with sprawling posture, but this may be incorrect. Its trackways lack belly-dragging marks and its spine exhibits […]