Stigmella omelkoi
 Stigmella omelkoi is a moth of the Nepticulidae family. It is found in Russia (Primorskiy Kray) Japan (Hokkaido) and China (Heilongjiang).The wingspan is 4.7-5.6 mm. There are two generations per year. Adults are on wing in May–June and again from July to early September.The larvae feed on Quercus mongolica (including var. grosseserrata in Japan) and Quercus serrata (in Japan). They mine the leaves of their host plant.