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Sphenotitan is an extinct genus of Rhynchocephalia reptile, known from the Late Triassic (Norian) Quebrada del Barro Formation of Argentina. It is the earliest known member of the herbivorous Eilenodontinae, and the only one known from the Triassic. It was a large-sized sphenodontian, with an estimated skull length of over . The skull is roughly triangular in shape, and had large upper temporal fenestrae. The region of the skull in front of the eye socket (preoribital region) is short. The premaxillae form a beak, with a cutting edge similar to a chisel. The teeth of Sphenotitan, like other elienodontines, were large and wide, and designed for shredding vegetation, with blade-like palatal teeth on the roof of the mouth.
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