5.Lystrosaurus.JPG (IMAGE)

Harvard University, Department of Organismic and Evolutionary Biology

5.Lystrosaurus.JPG

Caption

An example of an ever-growing, true tusk in the dicynodont Lystrosaurus. When researchers cut into the face of Lystrosaurus, the root of the tusks is composed of a wide open pulp cavity that suggests dentine was continuously being deposited.

Credit

Image by M. Whitney

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