Probactrosaurus sp.

Probactrosaurus was discovered during the Sino-Soviet Expedition (1959 - 60). It is a herbivorous ornithopod dinosaur, which resembles iguanodontids, but is more derived in having three stacked dentary teeth per tooth position and in lacking of accessory ridges on maxillary teeth. Therefore, Probactrosaurus is closer to the base of hadrosaurids.