A second species described in 1988 by Sereno and Zhao, along with two Chinese colleagues, was Psittacosaurus meileyingensis from the Jiufotang Formation, near the town of Meileyingzi, Liaoning Province, northeastern China. This species is known from four fossil skulls, one associated with some skeletal material, found in 1973 by Chinese scientists. The age of the Jiufotang in Liaoning is unknown, but in the neighboring province of Inner Mongolia, it has been dated to about 110 Ma, in the Albian stage of the Early Cretaceous.
P. meileyingensis has the shortest snout and neck frill of any species, making the skull is nearly circular in profile. The orbit (eye socket) is roughly triangular, and there is a prominent flange on the lower edge of the dentary, a feature also seen in P. major, and to a lesser degree in P. mongoliensis, P. lujiatunensis, P. sattayaraki, and P. sibiricus. The complete type skull, probably adult, is 13.7 centimeters (5.5 in) long.
Read more about this topic: List Of Psittacosaurus Species