Narrow corridor, spiralling around the leaves; often a part of the
mine runs in the deeper parts. Frass in strings, but not in the
typical pattern. Pupation as a rule 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.
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).
Hosts in Great Britain & Ireland:
of year - larvae: Currently unknown.
of year - adults: Currently unknown.
in Great Britain & Ireland: Coastal. Suffolk (Aldeburgh,
Holme and Butley) (Spencer, 1972b: 57); Glamorgan (NBN
Distribution elsewhere: Widespread in continental Europe including Germany (Schleswig-Holstein)
(von Tschirnhaus, 1981);
Denmark, Sweden (Spencer, 1976:
255; Spencer, 1990: 340)
and Poland (Martinez in Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.