Phyllonorycter pygmaea is a moth of the family Gracillariidae. It is known from Japan (the islands of Hokkaidō, Kyūshū, Shikoku and Honshū), Korea and the Russian Far East.Global Taxonomic Database of Gracillariidae (Lepidoptera)
The wingspan is 5-5.5 mm.
The larvae feed on Castanea crenata, Quercus acutissima, Quercus crispula, Quercus mongolica and Quercus serrata. They mine the leaves of their host plant.
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