Leaf-miner and case-bearer: Larva mining leaves, the blotches brownish. The final case is 8-11 mm long, slender, and fixed at 45° to leaf surface, with anal end laterally compressed. The case has a serrated keel due to formation from the edge of a leaf (British leafminers).

Spatulate leaf case. Strikingly slender, bivalved case, 8-11 mm long, with a slight curve at the rear end, that is keeled and often toothed. The end is laterally compressed. Mouth angle 45°. The full depth mines often are conspicuously brown (Bladmineerders van Europa).

Larva: The larva is illustrated in Bladmineerders van Europa.

Pupa: Details unknown.

Adult: Not illustrated in UKMoths (check for update). The male and ? female genitalia are illustrated by the Lepidoptera Dissection Group.

Hosts in Britain:

Hosts elsewhere:

Time of year - larvae: August to September, with some larvae developing more slowly, and feeding again in April and May (British leafminers).

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Britain including Bedfordshire, Buckinghamshire, East Kent, East Ross, East Suffolk, Glamorgan, Herefordshire, Hertfordshire, Isle Of Wight, Middlesex, North Essex,
North Hampshire, Shropshire, South Aberdeen, South Hampshire, South Wiltshire, South-west Yorkshire, Stafford, Surrey, West Gloucestershire, West Norfolk, West Suffolk 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).

Also recorded in the Republic of Ireland (Karsholt and van Nieukerken in Fauna Europaea).

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 Austria, Belgium, Croatia, Czech Republic, Danish mainland, Estonia, Finland, French mainland, Germany, Hungary, Italian mainland, Latvia, Lithuania, Macedonia, Norwegian mainland, Poland, Romania, Russia - Central, North and South, Sardinia, Slovakia, Slovenia, Spanish mainland, Sweden, Switzerland and The Netherlands. Also recorded in East Palaearctic and Near East (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.