What is "paraprotopteryx"

Paraprotopteryx is a genus of enantiornithine birds. Though initially reported to be from the Early Cretaceous Yixian Formation, later investigation showed the fossil actually came from the Qiaotou member of the Huajiying Formation of Fengning, Hebei Province, China, and is therefore of uncertain age. While much of the Huajiying Formation underlies the Yixian Formation, Ji and colleagues suggested in 2008 that the Qiaotou Member correlates with the Dawangzhangzi bed of the Yixian Formation, dated to ~122 Ma ago by Zhou in 2006.