Leaf-mine: Long, irregular, whitish linear mine which turns brown when older and has conspicuous frass in large widely-spaced black lumps. Pupation external (Spencer, 1976: 371 (fig. 647A), 372).

Very long, initially whitish, later brownish, upper-surface corridor, frequently starting near the leaf tip, often crossing itself. Frass in strikingly large black lumps, more widely spaced than their own diameter. Pupation outside the mine; exit slit in upper epidermis (Bladmineerders van Europa).

Larva: Details unknown.

Puparium: Posterior spiracles each with 25 or more bulbs (Spencer, 1976: 372).

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: June-October.

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: A boreal alpine species not known to occur south of Yorkshire. Britain including Yorkshire (Malham Tarn), Northumberland (Bamburgh) and Perth (Killin) (Spencer, 1972).

NBN Grid map:

Distribution elsewhere: Widespread in continental Europe including Denmark, Finland, Norway, Sweden (Spencer, 1976: 372), Belgium (de Bruyn and von Tschirnhaus, 1991), Germany (Spencer, 1976: 566), Austria, Czech Republic, French mainland, Hungary, Poland, Romania and Spanish mainland (Martinez in Fauna Europaea).

NBN interactive distribution map(s) of known host species in Great Britain and Ireland and elsewhere:

Parasitoids in Britain and elsewhere: Unknown.