Leaf-miner: Irregular
corridor; the sides are so irregular that it becomes a secondary
blotch locally. Pupation outside the mine (Bladmineerders van Europa).
Forms
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
leafminers).
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 and Ireland:
Hosts
elsewhere:
Time
of year - mines: May (British
leafminers).
Time
of year - adults: Currently unknown.
Distribution
in Great Britain and Ireland: Found first in 2005 by Robert Homan in Cheltenham, Glos. It has since been found in Cumbria, Northants, Kent, Yorkshire, Hampshire and in Ross & Cromarty and Moray in Scotland. It is likely to be more widespread and previously overlooked (British
leafminers).
Distribution
elsewhere: Germany and Poland (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere:
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