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Leaf-miner: The mine is greater than 20 mm long, lower epidermis with one strong crease often dividing in Y-shape at end near leaf-margin. There can be several mines on a leaf. Tends to favour young seedlings and saplings (British leafminers).

Remarkable large, lower-surface tentiform mine, usually between two side veins, 20-25 mm long. Lower epidermis with one sharp fold. Frass heaped in a corner of the mine, covered by some spinning. Often several mines in a, strongly contracted, leaf. Pupa brownish black in a whitish cocoon (Bladmineerders van Europa).

The mine is also illustrated in UKMoths.

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).

Described by Emmet at al. 1985a (Bladmineerders van Europa).

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

The cremaster is illustrated in British leafminers and Bladmineerders van Europa.

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

Hosts in Great Britain and Ireland:

Fagaceae
Quercus				British leafminers
Quercus				UKMoths
Quercus	petraea	Sessile Oak		Pitkin & Plant
Quercus	robur	Pedunculate Oak		Pitkin & Plant

Hosts elsewhere:

Fagaceae
Quercus	dalechamii			Bladmineerders van Europa
Quercus	petraea	Sessile Oak		Belgian Lepidoptera
Quercus	petraea	Sessile Oak		Bladmineerders van Europa
Quercus	robur	Pedunculate Oak		Belgian Lepidoptera
Quercus	robur	Pedunculate Oak		Bladmineerders van Europa
Quercus	rubra			Belgian Lepidoptera

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

Time of year - adults: May and August are the flight periods for the two generations (UKMoths).

Distribution in Great Britain and Ireland: Locally common throughout Britain, but more so in the south (UKMoths) including Bedfordshire, Caernarvonshire, Carmarthenshire, Denbighshire, Dorset, Durham, East Cornwall, East Kent, East Norfolk, East Suffolk, East Sussex, Easterness, Glamorgan, Herefordshire, Hertfordshire, Huntingdonshire, Isle of Wight, North Devon, North Essex, North Hampshire, North Somerset, Radnorshire, Shropshire, South Hampshire, South-west Yorkshire, Stafford, West Cornwall, West Gloucester, West Kent, West Lancashire, West Norfolk, West Suffolk and Worcestershire (NBN Atlas).

See also British leafminers distribution map.

Also recorded in the Republic of Ireland and Northern Ireland (National Biodiversity Data Centre Map).

Distribution elsewhere: Widespread in continental Europe including Austria, Belgium, Bulgaria, Czech Republic, Danish mainland, Estonia, European Turkey, Finland, French mainland, Germany, Greek mainland, Hungary, Italian mainland, Latvia, Lithuania, Luxembourg, Norwegian mainland, Poland, Portuguese mainland, Romania, Russia - Central, East, Northwest and South, Slovakia, Spanish mainland, Sweden, Switzerland, The Netherlands and Ukraine. Also recorded in Near East (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: