Leaf-mine: Initially a gallery is formed, this turning into a blotch, and later two successive conical leaf-rolls (UKMoths).

Initially a pale, later brown, usually lower-surface blotch. The blotch is preceded by an epidermal corridor, but that may be obliterated by the later blotch. Silk at the inside of the mine causes it to buckle up a bit and fold. The reddish brown frass is accumulated in a corner of the mine. The older larva leaves the mine and continues feeding inside an untidy cone, made by cutting off a strip of leaf tissue and stitching it in place with silk (Bladmineerders van Europa).

Larva: The larva is illustrated in Bladmineerders van Europa.

Pupa: In the final leaf roll made by the larva (British leafminers).

Adult: The adult is illustrated in UKMoths and the Encyclopedia of Life. The female genitalia, but not the male genitalia (check for update), are illustrated by the Lepidoptera Dissection Group.

Hosts in Britain:

Hosts elsewhere:

Time of year - larvae: July - September (British leafminers).

Time of year - adults: Flies in September and overwinters as an adult, after which it can be found until April or May (UKMoths).

Distribution in Great Britain and Ireland: Occurring locally in England, Scotland and parts of Ireland (UKMoths); Bedfordshire, Cambridgeshire, Cheshire, Cumberland, Denbighshire, East Norfolk, East Suffolk, Glamorgan, Middlesex, North Essex, Shropshire, Stafford, Surrey, Warwickshire, West Cornwall, West Norfolk, West Suffolk, Westmorland and Worcestershire (NBN Gateway - N.B. includes Watsonian Vice Counties having publicly available records that fall within or overlap the vice county border at 10km resolution or better i.e. a record for a vice county may relate to an adjacent vice county - for included datasets see NBN Grid map below).

NBN Grid map: Note that not all datasets on the NBN Gateway may be available on the map below. If you are an NBN Gateway registered user you can request access for missing datasets via the link 'Open interactive map in new window' below.

Distribution elsewhere: Widespread in continental Europe including Albania, Austria, Belarus, Belgium, Bulgaria, Corsica, Czech Republic, Danish mainland, Estonia, Finland, French mainland, Germany, Greek mainland, Hungary, Italian mainland, Latvia, Lithuania, Republic of Moldova, Norwegian mainland, Poland, Portuguese mainland, Romania, Russia - Central, East and South, Sardinia, Sicily, Slovakia, Spanish mainland, Sweden, Switzerland, The Netherlands and Yugoslavia (Karsholt and van Nieukerken 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.