Mine usually starts near tip of leaf as a small dark brown blotch;
it expands rapidly due to the presence of several larvae in the
same mine. This expansion is on a broad front but usually down only
one side of the midrib. The final mine is a large brownish subtriangular
blotch, which is darkest oin the vicinity of the origin.Under a
hand lens, the mine is clearly marked with manyy small patches of
parallel feeding-lines. The larvae leave the mine to pupate, but
occasionally the pupariria are attached to the leaf near to the exit
slit (Bland, 1997b: 181-4).
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).
Red-brown, elongate-ovoid, with the posterior spiracles each having
16-18 well-defined bulbs in an incomplete ellipse (Bland,
Hosts in Great Britain & Ireland:
elsewhere: Currently unknown.
of year - larvae: Late June to early August.
of year - adults: April-May the following year.
in Great Britain & Ireland: Southern highlands of Scotland
(Bland, 1997b: 181-4).
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elsewhere: Currently unknown (Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.