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Leaf-miner: A 'snail-trail'-like mine on the upper surface, long and sinuous, with a dark central frass trail, ending at the leaf margin (British leafminers).

Very long, rather broad, strictly epidermal, corridor that curves in dense loops over the leaf upperside, without ever crossing itself. Frass in a vague continuous central line. The gallery ends upon the leaf margin, where it widens a little, while the leaf margin folds over somewhat. Here pupation takes place, not in a cocoon (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).

Under a silk membrane on the margin of leaf (British leafminers). The pupa is illustrated in Bladmineerders van Europa.

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:

Salicaceae
Populus	alba	White Poplar		British leafminers
Populus	x canescens	Grey Poplar		British leafminers
Populus	x canescens	Grey Poplar		Pitkin & Plant

Hosts elsewhere:

Salicaceae
Populus	alba	White Poplar		Bladmineerders van Europa
Populus	x canescens	Grey Poplar		Bladmineerders van Europa
Populus	tremula	Aspen		Bladmineerders van Europa

Time of year - larvae: June-July, August-September.

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Britain including East Kent, East Norfolk, East Suffolk, Isle of Wight, South Devon, South Hampshire and West Suffolk (NBN Atlas).

See also British leafminers distribution map.

Distribution elsewhere: Widespread in continental Europe including Austria, Belgium, Czech Republic, Danish mainland, French mainland, Germany, ? Hungary, Italian mainland, Poland, ? Portuguese mainland, Romania, Slovakia, Spanish mainland, Switzerland and The Netherlands. Also recorded in Near East (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: