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Leaf-miner
and case-bearer:
The larva creates a succession of cases, in this instance fashioned
from parts of a leaf. The final case is 11-13 mm long, slender,
and fixed at 45° to the leaf surface, with anal end laterally
compressed and bivalved (British
leafminers).
A
slender, brown, spathulate leaf case, in the end about 13 mm long;
mouth angle about 15°. Young case slender, not hooked (Bladmineerders
van Europa).
Larva:
The larva is described and illustrated in Bladmineerders
van Europa.
The
case is described and illustrated in UKMoths,
British
leafminers and Bladmineerders
van Europa.
Pupa:
Details unknown.
Adult:
The adult is illustrated in UKMoths.
The male
genitalia, but not the femaile genitalia (check
for update), are illustrated by the Lepidoptera Dissection Group.
Hosts
in Britain:
Hosts
elsewhere:
Time
of year - larvae:
Probably from September (early feeding not recorded) to November,
feeding again from late May to June or July. There is also a biennial
population, which aestivates and completes feeding in June or July
of the second year (British
leafminers). The species overwinters in a cases, in some populations
twice before emerging as an adult (UKMoths).
Time
of year - adults: Mainly in July and August. Some populations
only produce adults every two years (UKMoths).
Distribution
in Great Britain & Ireland: A rather local species which
is slowly increasing its range. It occurs in scattered colonies
in central and southern England, but also occasionally elsewhere
(UKMoths)
including East Kent, Hereford, West Gloucester and Worcester (NBN
Gateway distribution map - JNCC
and NE).
NBN
Grid map:
Distribution
elsewhere: Widespread in Europe including Austria, Belgium,
Czech Republic, Danish mainland, Estonia, Finland, French mainland,
Italian mainland, Latvia, Lithuania, Norwegian mainland, Poland,
Romania, Sardinia, Slovakia, Slovenia, Swede, Switzerland and The
Netherlands (Karsholt & van Nieukerken in Fauna
Europaea).
NBN
interactive distribution maps of known host species in Britain and
elsewhere:
Parasitoids
in Britain and elsewhere: Unknown.
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