narrow linear mine which can develop into a secondary blotch (Spencer,
mine in the tip of a leaf segment in primary corridor, but quickly
turning into secondary blotch within the limited space of the leaf
segment. The mine begins in the very tip of the segment, this initial
section later becomes unrecognisable. Frass in fine granules. Pupation
outside the mine (Bladmineerders van Europa).
Larva: The larvae of flies are leg-less maggots without a head capsule (see examples). They never have thoracic or abdominal legs. They do not have chewing mouthparts, although they do have a characteristic cephalo-pharyngeal skeleton (see examples), usually visible internally through the body wall.
The larva is described by de Meijere (1926).
Posterior spiracles each with approx. 22 bulbs.
Puparium: The puparia of flies are formed within the hardened last larval skin or puparium and as a result sheaths enclosing head appendages, wings and legs are not visible externally (see examples).
Black; posterior spiracles each with some 22 bulbs (Spencer,
Hosts in Great Britain & Ireland:
of year - mines:
June-July and August-September (Hering,
of year - adults: Currently unknown.
in Great Britain & Ireland: Recorded as new to Britain by
Irwin (1985: 103). Known from
Cambridgeshire and East Norfolk (NBN
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elsewhere: Widespread in continental Europe including Germany,
Norway, Poland, Sweden (Spencer,
1976: 517), The Netherlands (Bladmineerders van Europa), Hungary and Lithuania (Martinez in Fauna Europaea).
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British and Irish Parasitoids in Britain and elsewhere: