In this study, the imagoes and subimagoes of Polyplocia orientalis Nguyen & Bae, 2003 (Ephemeroptera, Euthyplociidae) were reared from nymphs in lab described for first time. Nymphal structures are also photographed described. The species can be identified by having transparent wings (except costal subcostal areas), sterna without regular markings penis divergent apical half basal fused. K2...