Wingspan c. 9-10mm.
A relatively widespread species over much of Britain, occurring on wet and acid heathland and similar boggy habitats.
The adults are fairly distinctive with their dark elongated forewing spot on a pale ground colour, although there are possible confusion species, so genitalia dissection is recommended for definitive identification.
The food plants are various sedges, including Carex and Eriophorium, the larva creating a gallery mine from around late April typical of the genus.
There is a single generation, with adults on the wing between June and August.