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and, along with the Diadectidae, the earliest known herbivorous tetrapods. The palatal dentition on the roof of the mouth changed from being relatively unspecialised in early members like Ianthasaurus, towards being modified into specialised raised batteries, which interlocked with a similar battery on the lower jaw in Edaphosaurus, which served to grind plant material. The upper surface of the body has a large neural spine sail

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