Systoloneura geometropis is a moth of the Gracillariidae family. It is known from Hong Kong, Taiwan and Japan (Honshū, Kyūshū, Satunan and Shikoku). The wingspan is 4.5-6.2 mm. The larvae feed on Gardenia augusta, Gardenia jasminoides and Gardenia radicans. There are four instars in larval period, the first two are of sap-feeding type with a flat head, and the last two are of tissue-feeding type with a round head and a cylindrical body as in Aristaea species. First instar larva mine the lower layer of spongy parenchymal tissues and makes a short linear mine along the vein. A short time after it broadens the mine into a blotch. In the second instar, it continues to make a blotch-mine, which finally occupies a more or less full area between two branching veins. In the third and fourth instar