Gynnidomorpha permixtana, the coast conch, is a species of moth of the Tortricidae family. It is found in China (Anhui, Beijing, Fujian, Gansu, Guizhou, Hainan, Hebei, Heilongjiang, Henan, Hubei, Liaoning, Ningxia, Shaanxi, Shandong, Shanghai, Shanxi, Sichuan, Tianjin, Xizang, Zhejiang), Afghanistan, Iran, Japan, Korea, Mongolia, Russia and Europe. The habitat consists of waste ground, damp heathland and mosses. The wingspan is 8–12 mm. Adults are on wing yearly year round. The larvae feed on Alisma, Gentiana, Euphrasia and Pedicularis species. They feed within the stems of their host plant.