The most recently described species of "Psittacosaurus" is "P. lujiatunensis", which is based on four skulls from the lower beds of Yixian Formation of Liaoning Province, near the village of Lujiatun, China.
The most recently described species of "Psittacosaurus" is "P. lujiatunensis", named in 2006 by Chinese paleontologist Zhou Chang-Fu and 3 Chinese colleagues. It is the oldest known species, based on four skulls from the lower beds of Yixian Formation of Liaoning Province, near the village of Lujiatun, China.