Nationally scarce (Nb) in saltmarshes along much of the coast of England, from Cornwall to Yorkshire, and in parts of Wales. In Hampshire and on the Isle of Wight restricted to coasts in the south-east of the county and north-west of the Island. Wingspan 12-14 mm. Like many of the Coleophora, imagines are virtually impossible to identify without recourse to dissection, and the larvae, which live in cases of characteristic form and which can sometimes be found on the foodplant, may be easier to identify by comparison against a reference collection. Larva feeds within seeds of Glasswort, living within a movable case, buried in mud.