Larva mines leaves (British
leafminers). The larva builds a case from silk, resembling a
razor shell in appearance. (UKMoths).
full-grown case is 12 mm long and blackish-brown (British
leafminers). The full grown larva lives in a blackish brown
trivalved tubular silken case of about 8 mm.
mouth angle is 0°-10°, causing the case to lay almost flat
on the leaf (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).
Head and plates black. Body dull yellowish white; prothoracic plate
large with median sulcus; mesothoracic plate consisting of four
sclerites, the anterior pair dot-like and widely separared, the
posterior pair subrtriangular and closely approximated; metathorax
with two small, well-separated dorsal sclerites; thoracic segments
with small lateral sclerites; an anal plate; four pairs of abdominal
prolegs (Emmet at al., 1996a) (Bladmineerders van Europa).
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The adult is illustrated in UKMoths.
and female genitalia are illustrated by the Lepidoptera Dissection Group.
Hosts in Great Britain & Ireland:
of year - larvae: August to October on Thistle, probably full-grown
in autumn. September to October on Knapweed, feeding again from
April until May or June (British
of year - adults: The nocturnal adults fly in July and August
and are attracted to light (UKMoths).
in Great Britain & Ireland: Occurring throughout most of
the British Isles (UKMoths),
including Bedfordshire (VC30), Caernarvonshire (VC49), Cambridgeshire (VC29), Cheshire (VC58),
Denbighshire (VC50), Derbyshire (VC57), County Durham (VC66), East Kent (VC15), East Norfolk (VC27), East Suffolk (VC25), East Sussex (VC14), Easterness (VC96), Flintshire (VC51), Glamorganshire (VC41), Herefordshire (VC36),
Kincardineshire (VC91), Merionethshire (VC48), North Essex (VC19), North Hampshire (VC12), Pembrokeshire (VC45),
Shropshire (VC40), South Aberdeenshire (VC92), South Wiltshire (VC8), Staffordshire (VC39), Surrey (VC17), West Cornwall (VC1), West Kent (VC16), West Norfolk (VC28), West Suffolk (VC26), Westmorland (VC69) and
Worcestershire (VC37) (NBN
Gateway) and Ireland (Karsholt and van Nieukerken in Fauna Europaea).
Also recorded in the Republic of Ireland. See also Ireland's NBDC interactive map.
NBN Grid Map:
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elsewhere: Widespread in continental Europe including Austria,
Belgium, Croatia, Czech Republic, Danish mainland, Estonia, Finland,
French mainland, Germany, Hungary, Italian mainland, Latvia, Lithuania,
Norwegian mainland, Poland, Romania, Russia - Central and North,
Slovakia, Sweden and Switzerland. Also recorded in the East Palaearctic
(Karsholt and van Nieukerken in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: