Diplocaulus

A 1 meter long lepospondyl known for its characteristic boomerang like head, it likely used it like a hydrofoil to move faster underwater

ALT: while there's no soft tissue to prove it, it might have had skinflaps around the body allowing it to move like a stingray

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Different types of anoplasty flaps used for the treatment of anal stenosis. For a general surgery textbook chapter.

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