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Leaf-miner
and case-bearer:
The case resembles that of C.
violacea, but does not lie so flat again the leaf as this
species (having a mouth angle of 30 to 50°). C.
violacea also has a case which bulges in the middle, whereas
in C. potentillae the case tapers towards the posterior (British
leafminers).
Immediately
after emergence the larva makes a full depth, quickly widening,
corridor, with frass as small grains in a broad central band. Finally
results a blotch of 2 x 5 mm, from which the youth case is cut.
The fully developed case is a hairy, greyish brown to silver grey
lobe case of about 1 cm long, with a clearly laterlly compressed
end; the mouth angle is about 90°. The case is difficult to
separate from the one of C. ochripennella (Bladmineerders
van Europa).
Larva:
The larva is described and illustrated in Bladmineerders
van Europa.
Pupa:
Details unknown.
Adult:
Not illustrated in UKMoths (check
for update). The genitalia are not illustrated by the Lepidoptera
Dissection Group (check
for update).
Hosts
in Britain:
Hosts
elsewhere:
Time
of year - larvae: September - May (British
leafminers).
Time
of year - adults: Unknown.
Distribution
in Great Britain & Ireland: British Is. (Karsholt &
van Nieukerken in Fauna
Europaea) including Northampton (Bozeat, Horn Wood) (British
leafminers), Cambridge, Clyde Isles, East Cornwall, East Kent,
East Sussex, Hereford, Herts, Hunts, Isle of Wight, Mid Ebudes,
North Ebudes, North Hants, South-west York and Surrey (NBN
Gateway distribution map - BRERC,
JNCC, NE
and SNH).
Also
recorded in the Republic of Ireland (Karsholt & van Nieukerken
in Fauna
Europaea).
NBN
Grid map:
Distribution
elsewhere: Widespread in Europe including Belgium, Czech Republic,
Danish mainland, Estonia, Finland, French mainland, ? Germany, Latvia,
Norwegian mainland, Poland, Sweden 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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