Abstract
Three new species-Enneoxyela aculeata sp. nov., Enneoxyela eucalla sp. nov., and Hemixyela elongata gen. et sp. nov.-are described and illustrated from the Lower Cretaceous Yixian Formation at Huangbanjigou, Liaoning Province, China. Meanwhile, two new genera are established by the species previously described after re-examination, Tugnuxyela gen. nov. based on T. tugnuica comb. nov. (Rasnitsyn, 1982), from the Lower Jurassic of Transbaikalian in Russia, and Junfengixyela gen. nov. based on J. cenozoica comb. nov. (Zhang, 1989) from the Miocene of Shandong in E. China. This is the first occurrence of the tribe Xyelini in the Cretaceous of China. A male specimen is described for the first time in Mesozoic Xyelini; it is found sufficiently similar to the known (Cenozoic) males of the tribe, including the genitalia twisted for 180°. Keys to the genera of Xyelini and to the species of Enneoxyela are provided.