Leaf-miner: A short, twisting irregular gallery with frass filling two-thirds of its width. In exposed leaves the frass is densely packed, whereas in shaded leaves it is thinner (British
leafminers). It usually forms distinct dark brown mines, darker than S. aurella and the gallery edges are more conspicuously purple.
Egg
on the leaf upperside. The mine is an unusually short, not very
tortuous corridor with a central line of frass that is irregularly
interrupted and takes about 2/3 of the corridor width. Pupation
external (Bladmineerders van Europa).

Mine of Stigmella auromarginella on Rubus fructicosus agg.
Image: © Tony Davis (British
leafminers)
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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 of auromarginellais amber yellow, head very light brown. The characteristic pattern
of spinulation is depicted by Gustafsson and van Nieukerken (1990a)
(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:
Time
of year - larvae: Throughout the year (British
leafminers).
Time
of year - adults: Currently unknown.
Distribution
in Great Britain and Ireland: Britain including Dorset and
South Wiltshire (NBN
Atlas).See also British
leafminers distribution map.
Also
recorded in the Republic of Ireland (Fauna Europaea and National Biodiversity Data Centre Map).
Distribution
elsewhere: Widespread in continental Europe including Crete,
Croatia, Cyprus, Danish mainland, French mainland, Portuguese mainland
and Sweden (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere:
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