corridor; the sides are so irregular that it becomes a secondary
blotch locally. Pupation outside the mine (Bladmineerders van Europa).
a gallery/blotch mine which is brown in colour, with a pale yellow
margin.The mines variy in morphology, forming a gallery come blotch,
brown in colour with a pale yellow margin. The overall shape of
the mine reflects the form of the leaves; thus, the first generation
in May/June on lower wide leaves tend to be broad in extent, whereas
the late generation in July/August on the narrow flowering stem
leaves tend to be more gallery-like (British
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 illustrated in Bladmineerders van Europa.
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 - mines: May (British
of year - adults: Currently unknown.
in Great Britain & Ireland: First recorded in Britain in
2009 by David Manning (British
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elsewhere: Germany and Poland (Fauna Europaea).
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British and Irish Parasitoids in Britain and elsewhere: