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Leaf-miner: The mine is small, usually in lobe of leaf, causing the lobe to fold downwards (British leafminers).

Relatively small, lower surface tentiform mine. The mine lies often under a leaf segment, and when the mine develops and contracts the segment usually folds down over the mine. The larva also feeds upon the palisade parenchyma of the roof of the mine, causing the upper surface of the leaf to appear damaged. Pupa blackish brown in a tight, thin-walled cocoon that is attached to the floor of the mine; all frass is accumulated in the opposite corner of the mine (Bladmineerders van Europa).

Larva: The larvae of moths have a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding), six thoracic legs and abdominal legs (see examples).

Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).

The cremaster has four hooks (British leafminers). The pupa is illustrated in Bladmineerders van Europa.

Adult: The adult is illustrated in UKMoths. The species is included in mothdissection.co.uk.

Hosts in Great Britain and Ireland:

Aceraceae
Acer	campestre	Field Maple		British leafminers
Acer	campestre	Field Maple		Pitkin & Plant
Acer	campestre	Field Maple		UKMoths

Hosts elsewhere:

Aceraceae
Acer	campestre	Field Maple		Belgian Lepidoptera
Acer	campestre	Field Maple		Bladmineerders van Europa
Acer	tataricum	Tartar Maple		Bladmineerders van Europa

Time of year - larvae: July and more commonly in September and October (UKMoths).

Time of year - adults: The adults emerge in two generations, in May and August (UKMoths).

Distribution in Great Britain and Ireland: Widespread in England and Wales, including Bedfordshire, Breconshire, Buckinghamshire, Cambridgeshire, Cheshire, Denbighshire, Derbyshire, Dorset, Durham, East Gloucestershire, East Kent, East Norfolk, East Suffolk, Glamorgan, Herefordshire, Hertfordshire, Huntingdonshire, Isle of Wight, Leicestershire, Montgomeryshire, North Essex, North Hampshire, North Somerset, Northamptonshire, Radnorshire, Shropshire, South Hampshire, South Wiltshire, Stafford, Surrey, Warwickshire, West Gloucestershire, West Kent, West Lancashire, West Norfolk, West Suffolk, Westmorland and Worcestershire (NBN Atlas).

See also British leafminers distribution map.

Distribution elsewhere: Widespread in continental Europe including Albania, Austria, Belarus, Belgium, Bulgaria, Czech Republic, Danish mainland, French mainland, Germany, Hungary, Italian mainland, Republic of Moldova, Poland, Romania, Russia - Central and South, Slovakia, Sweden, Switzerland, The Netherlands, Ukraine, Yugoslavia. Also recorded in Near East (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: