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Leaf-miner: Egg invariably at the leaf underside. From there runs a short gallery, often partly following the leaf margin, almost stuffed with frass. The corridor widens into a blotch that may occupy half a leaf; the frass here is dispersed. Pupation extrernal. Vacated mines turn black (Bladmineerders van Europa).

A short gallery, almost filled with frass, which usually follows the leaf edge then becomes a blotch, with dispersed frass, and occupying half the leaf. The vacated mines appear black (British leafminers).

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).

Yellow (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:

Salicaceae
Salix	repens	Creeping Willow		Pitkin & Plant
Salix	repens	Creeping Willow		British leafminers

Hosts elsewhere:

Salicaceae
? Salix	fusca			Bladmineerders van Europa
Salix	lapponum			Bladmineerders van Europa
Salix	repens	Creeping Willow		Bladmineerders van Europa
Salix	repens subsp. arenaria			Bladmineerders van Europa

Time of year - larvae: About the first half of July and the first half of October (Bladmineerders van Europa).

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Britain including East Kent (NBN Atlas).

See also British leafminers distribution map.

S. zelleriella is now not considered as occurring in Ireland - it is listed as such on the website (ref Fauna Europeaea) – the single record was removed by Ken Bond following a review of the genitalia preparation – it was in fact S. salicis. (Bulletin of the Irish Biogeographical Society 36 (2012) : 20) (per. comm. Dave Allen).

Distribution elsewhere: Widespread in continental Europe including Belgium, Czech Republic, Danish mainland, Finland, Germany, Lithuania, Norwegian mainland, Poland, Russia - Central, North and Northwest, Sweden and The Netherlands (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: Currently unknown.