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Elachista utonella
''Elachista utonella'' is a moth of the Elachistidae family. It is found from Fennoscandia to the Pyrenees and Italy and from Ireland to Romania. Extending east to the Russian Far East and Japan.
The wingspan is .〔(Microlepidoptera.nl )〕 There is one generation per year in Great Britain, but there are possibly two generations in continental Europe.
The larvae feed on ''Carex acutiformis'', ''Carex brizoides'', ''Carex distans'', ''Carex disticha'', ''Carex echinata'', ''Carex elata'', ''Carex flacca'', ''Carex hirta'', ''Carex muricata'', ''Carex paniculata'', ''Carex remota'', ''Carex riparia'', ''Carex spicata'', ''Carex vesicaria'', ''Festuca'', ''Juncus gerardii'' and ''Scirus sylvaticus''. They mine the leaves of their host plant. The mine The mine starts halfway the blade as an upwards running corridor. Later, it reverses its course and becomes an elongate blotch occupying half the width of the leaf. The frass is light green at first but becomes grey later. It is deposited in the lowest part of the mine. Pupation takes place outside of the mine.〔(【引用サイトリンク】title=''Elachista utonella'' Frey, 1856 )〕 They are yellowish green to greyish with a black head.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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