''Elachista tetragonella'' is a moth of the family Elachistidae. It is found from

Fennoscandia __NOTOC__ Fennoscandia (Finnish language, Finnish, Swedish language, Swedish and no, Fennoskandia, nocat=1; russian: Фенноскандия, Fennoskandiya) or the Fennoscandian Peninsula is the geographical peninsula in Europe, which includes ...

to Spain and Italy and from France to Bulgaria. The wingspan is . Adults are on wing in January and again in June. The larvae feed on ''

Carex montana ''Carex montana'', also called mountain or soft-leaved sedge, is a species of grass of the genus '' Carex''. It is most commonly found in Europe and Central Russia. It is native to most countries in Europe including the UK, Germany, France and ...

''. They mine the leaves of their host plant. The mine has the form of a white elongate gallery in the top region of the leaf. The

frass Frass refers loosely to the more or less solid excreta of insects, and to certain other related matter. Definition and etymology ''Frass'' is an informal term and accordingly it is variously used and variously defined. It is derived from the G ...

is deposited irregularly. Pupation takes place outside of the mine. They are dirty yellow with a pair of grey dorsal length lines and a yellowish head. Larvae can be found from April to the end of May.

References

tetragonella Moths described in 1855 Moths of Europe {{Elachista-stub