Endangered (proposed as a future Red Data Book species) in northern Devon and southern Wales. First recorded at Tintern, Monmouthshire, in 1962, and at Ifracombe, North Devon, in 1985, and also recorded in Glamorgan. Not recorded in Hampshire or on the Isle of Wight to date. Wingspan 14-17 mm. Very similar to
C. lacunana from which reliably separated only by dissection of the genitalia. Larva feeds within roots of Sow-thistle and Hawk's-beard, living within a silken tube or tent.