Telamoptilia prosacta is a moth of the Gracillariidae family. It is known from Thailand, Taiwan, Indonesia (Java), India (Bihar), Japan (the Ryukyu Islands) and Fiji. The wingspan is 6.5–8 mm. The larvae feed on Ipomoea species, including Ipomoea batatas. They mine the leaves of their host plant. It has not been recorded as a severe pest.In Japan, however, it heavily infested the leaf of sweet potato in Yakusima, the larval leaf-mines having been found on almost all the leaves of the plant in some cultivated fields in autumn.