Deoptilia heptadeta is a species of moth in the family Gracillariidae. It is known from Japan (the Ryukyu Islands, Kyūshū, Shikoku, Honshū, Tusima, the Amami Islands) and Taiwan.Global Taxonomic Database of Gracillariidae (Lepidoptera)
The wingspan is 6.3–8.3 mm.
The larvae feed on Mallotus japonicus. They mine the leaves of their host plant.
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