List of characters used to describe each Lujiatun psittacosaurid species.

A number of characters are seen in multiple species, are taphonomically variable and are not true characters, or are seen gradationally across a large sample set of Lujiatun psittacosaurids suggesting that the absolute seen in any particular specimen is not a character separating species, but is an extreme on the end of a gradual continuum. 1 = P. lujiatunensis, 2 = P. major, 3 = Hongshanosaurus, 4 = Characters gradationally variable among 25 Lujiaun P. sp studied, 5 = Taphonomically variable characters.