Monochroa tetragonella, the saltern neb, is a moth of the family Gelechiidae. It is found in Scandinavia, the Baltic region, Great Britain, the Netherlands and Russia (including the Altai and Transbaikalia).[2] The habitat consists of saltmarshes.
The wingspan is 9–11 mm. Adults are on wing from June to July.[3]
Larvae feed on sea milkwort (Lysimachia maritima), mining the leaves.[4]
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