Thin-section Antarctic Lystrosaurus (IMAGE)

Harvard University, Department of Organismic and Evolutionary Biology

Thin-section Antarctic Lystrosaurus

Caption

3) This thin-section of the fossilized tusk from an Antarctic Lystrosaurus shows layers of dentine deposited in rings of growth. The tusk grew inward, with the oldest layers at the edge and the youngest layers near the center, where the pulp cavity would have been. At the top right is a close-up view of the layers, with a white bar highlighting a zone indicative of a hibernation-like state. Scale bar is 1 millimeter.

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Megan Whitney/Christian Sidor

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