Leontinia is an extinct genus of leontiniid notoungulate. Fossils have been found from the Deseado Formation in Argentina, and are the most abundant remains of any animal found there. The genus dates back to the late Oligocene. In Leontinia, the first incisors of the upper jaw are small cropping teeth, while the second are elongated and form caniniform tushes. In the lower jaw it is the third incisors have developed into tushes, not the second.
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