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Lystrosaurus was a medium-sized to larger therapsid, maximally 2,5 meters long with a weight of less than 100kg. It has been recorded in India, Antarctica, China, Mongolia, and the European part of Russia. The geographic distribution of Lystrosaurus is one of the oldest direct evidence of plate tectonics and continental drift in geologic time. The absence of teeth, except for the two marked upper canines, is typical. Its mouth has a beak-like structure, and its extremities and tail are short and massive. ## Keywords Mesozoic, Lower Triassic, Therapsida, Dicynodontia
