Larva initially forms a narrow lower surface linear mine, later
producing a large blotch, frequently adjoining the leaf-margin on
the upper surface. Several larva can feed together (Spencer,
blotch at the leaf margin, preceded by a lower-surface corridor.
Most frass in the centre of the blotch. Often several larvae in
a mine. Primary and secondary feeding lines well visible. 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 Hering (1967,
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).
Orange-yellow; posterior spiracles each with an ellipse of some
8 bulbs (Spencer, 1976: 269).
Hosts in Great Britain & Ireland: Currently unknown.
of year - mines:
May and August-September (Hering,
of year - adults: Currently unknown.
in Great Britain & Ireland: Added to British Checklist by
Henshaw in Chandler, 1998:
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elsewhere: Widespread in continental Europe including Poland
(Spencer, 1976: 269), Sweden
(Spencer, 1976: 269; Bladmineerders van Europa), Czech Republic, Estonia, French mainland, Germany,
Lithuania, Poland and Spanish mainland (Martinez in Fauna Europaea).
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British and Irish Parasitoids in Britain and elsewhere: