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Stigmella longisacca is a moth of the Nepticulidae family. It is found in California, United States.
The wingspan is 3.2-4.4 mm. There are two and possibly three generations per year.
The larvae feed on Juglans species, including Juglans californica. They mine the leaves of their host plant.
References
Stigmella longisacca Wikipedia(Text) CC BY-SA