Monochroa tetragonella
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. The habitat consists of saltmarshes.
The wingspan is 9–11 mm. Adults are on wing from June to July.
Larvae feed on sea milkwort, mining the leaves.