linear mine with two rows of frass (Spencer,
1976: 112, fig. 181).
are deposited singly, near the leaf margin, at some distance from
the leaf tip. From this point an upper-surface corridor-blotch develops.
Initially a narrow corridor ascends towards the tip; after some
time the direction switches and the mine, now widening quickly,
descends towards the leaf base. Frass in two rows. Puparium within
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 Griffiths (1963).
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).
Reddish-brown. Posterior spiracles, each with 3 bulbs, separated
by about 3 times their diameter (Spencer,
Hosts in Great Britain & Ireland: Currently unknown.
of year - larvae:
June and August (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Added to British checklist by
Cole in Chandler (1998:
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elsewhere: Widespread in continental Europe including The Netherlands
(Bladmineerders van Europa), Belgium (Scheirs,
de Bruyn and von Tschirnhaus, 1995), Germany (Spencer,
1976: 546), Austria, Denmark, Estonia, Finland, Hungary, Lithuania,
Poland, Spanish mainland and Sweden (Martinez in Fauna Europaea).
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British and Irish Parasitoids in Britain and elsewhere: