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Metriochroa fraxinella : ウィキペディア英語版 | Metriochroa fraxinella
''Metriochroa fraxinella'' is a moth of the Gracillariidae family. It is known from Japan (Honshū, Kyūshū and the Ogasawara Islands).〔(Global Taxonomic Database of Gracillariidae (Lepidoptera) )〕 The wingspan is 5.2-8.2 mm. There are at least two generations per year in temperate Japan (Honsyu and Kyusyu), because adults are on wing in summer (from June to July) and in autumn (from late September to early October). The larvae feed on ''Fraxinus'' species (including ''Fraxinus sieboldiana''), ''Ligustrum japonicum'' and ''Ligustrum micranthum''. They mine the leaves of their host plant. The mine is found under the upper cuticle of the leaves. It is narrowly linear, very long, irregularly curved, and sometimes occupying the whole leaf surface. It is whitish with a brownish central line of frass. Pupation takes place within the mine in a pupal chamber that is located at the end of the mine. This chamber is ellipsoidal, with a strongly swollen lower side and a wrinkled upper side. ==References==
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