and case-bearer: Larva in a slender, brownish black, bivalved
sheath case of 7-8 mm. The oral half is tubular, the rear part strongly
laterally compressed. Mouth angle 30°.
the case only looks like a sheath case. The larva cuts off mined
leaves, after having removed the complete leaf margin: what is left
is an upper and a lower epidermis, connected by the stub of the
petiole. Leaves treated in this way are placed in front of the old
case, the stub dorsally, and pointing forwards. The stubs together
form a low dorsal keel. The case in fact is a composite leaf case.
However, the larva adds so much silk (also because the leaves are
too small to form a complete tube) the the leaf fragments are obliterated
(Emmet et al., 1996a) (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).
A differential character is that the larva of niveicostella
has the metanotum unicolorous with remainder of the pale greenish
body, while in albitarsella the metanotum bears two oval
black sclerites. See Suire (1961a) and Emmet at al. (1996a) for
descriptions of the larva (Bladmineerders van Europa).
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The adult is not illustrated in UKMoths (check for update). The male genitalia, but not the female genitalia (check for update), are illustrated by the Lepidoptera
Hosts in Great Britain & Ireland:
of year - larvae:
Mid June (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Britain including Bedfordshire (VC30),
East Kent (VC15), Hertfordshire (VC20), North Hampshire (VC12), South Wiltshire and Surrey
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elsewhere: Widespread in continental Europe including Albania,
Austria, Belgium, Bulgaria, Croatia, Czech Republic, Danish mainland,
French mainland, Germany, Greek mainland, Hungary, Italian mainland,
Latvia, Macedonia, Poland, Romania, Slovakia, Slovenia, Spanish
mainland, Sweden, Switzerland and The Netherlands. Also recorded
in Near East and North Africa (Karsholt and van Nieukerken in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.