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Caloptilia issikii is a moth of the Gracillariidae family. It is known from China, Japan (the islands of Hokkaidō and Honshū) and the Russian Far East.
The wingspan is 10.8-11.5 mm.
The larvae feed on Alnus species, including Alnus japonica. They mine the leaves of their host plant.
References
Caloptilia issikii Wikipedia(Text) CC BY-SA