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Pantodonta (superorder Paenungulata, order Amblypoda) An extinct suborder of ungulates which lived during the Palaeocene and Eocene, mainly in N. America, but survived into the Oligocene in Asia. Early forms were small (e.g. Pantolambda was the size of a large dog), had short limbs, and large, broad feet. Later forms grew much larger (e.g. Barylambda, which was about 2.4 m long, and the hippopotamus-like Corphodon). Some developed claws rather than hoofs and in some the canines became enlarged, probably enabling them to feed on roots. The name Pantodonta is sometimes used synonymously with Amblypoda (in which case it is regarded as an order).