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Leaf-miner: The gallery is long and sinuous, filled with greenish frass. The initial mine is greenish/brown and becomes more visible as it ages and goes browner (British leafminers).

Ovipostion close to a thick vein, mostly at the upper side. The mine is a long, slowly widening, slender corridor, with a characteristic sinuous course. Frass completely filling the corridor, in clear arcs, green when fresh, brown later. Fresh mines are almost concolorous with the leaf, and not very apparent (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).

The larva is green (British leafminers and Bladmineerders van Europa).

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

Adult: The adult is not illustrated in UKMoths (check for update). The species is included in mothdissection.co.uk.

Hosts in Great Britain and Ireland:

Hosts elsewhere:

Fagaceae
Castanea	sativa	Sweet Chestnut		Belgian Lepidoptera
Castanea	sativa	Sweet Chestnut		Bladmineerders van Europa
Quercus				Belgian Lepidoptera
Quercus	castaneifolia	Chestnut-leaved Oak		Bladmineerders van Europa
Quercus	cerris	Turkey Oak		Bladmineerders van Europa
Quercus	frainetto			Bladmineerders van Europa
Quercus	macrolepis			Bladmineerders van Europa
Quercus	petraea	Sessile Oak		Bladmineerders van Europa
Quercus	pubescens	Downy Oak		Bladmineerders van Europa
Quercus	pyrenaica	Pyrenean Oak		Bladmineerders van Europa
Quercus	robur	Pedunculate Oak		Bladmineerders van Europa
Quercus	rubra	Red Oak		Bladmineerders van Europa

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

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Widespread in Britain including Banffshire, Bedfordshire, Cambridgeshire, East Kent, East Norfolk, East Suffolk, Elgin, Glamorgan, Herefordshire, Hertfordshire, Huntingdonshire, Isle of Wight, Middlesex, North Essex, North Hampshire, North Somerset, South Aberdeenshire, South Wiltshire, Surrey, Warwickshire, West Kent, West Norfolk, West Suffolk and Worcestershire (NBN Atlas). See also British leafminers distribution map.

Also recorded in the Republic of Ireland (Fauna Europaea).

Distribution elsewhere: Widespread in continental Europe including Austria, Belgium, Bulgaria, Croatia, Czech Republic, Estonia, Finland, French mainland, Germany, Greek mainland, Hungary, Italian mainland, Lithuania, Republic of Moldova, Norwegian mainland, Poland, Portuguese mainland, Romania, Russia - Central, East and South, Slovakia, Slovenia, Spanish mainland, Sweden, Switzerland, The Netherlands, Ukraine and Yugoslavia. Also recorded in Near East and North Africa (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: