(Ji et al. 1999, Chiappe et al. 1999; GMV-2129) is an Early Cretaceous relative of Zhongornis and Confuciusornis preserved as a plate and counter plate, flattened, but complete and articulated… with feathers and skin outlines (Figs. 1, 2).
Missing from the original tracing
are the postorbital bones, the pubis, some tiny teeth and a series of caudal vertebrae (not a pygostyle) as in other confuciusornithiformes (Fig. 4).
Here it is reconstructed (Fig. 3).
So far (as I know…)
Changchengornis is the only confuciusornithiform (Fig. 4) with a convex rostrum. It also has the shortest tail. At present this clade only extends from the Late Jurassic to the Early Cretaceous.
Ji Q, Chiappe L and Ji S 1999. A new Late Mesozoic confuciusornithid bird from China. Journal of Vertebrate Paleontology 19(1): 1–7.
Chiappe LM, Ji S-A, J Q, Norell MA 1999. Anatomy and systematics of the Confuciusornithidae (Theropoda:Aves) from the Late Mesozoic of northeastern China. Bulletin of the American Museum of Natural History 242: 89pp. PDF