A secondary blotch near the apex of a leaf segment which develops
from short, adjoining sections of a linear mine. Pupation takes
place in the mine (Spencer, 1976:
compact secondary blotch, without islets of unmined tissue. Mine
without brown discoloration. Both primary and secondary feeding
lines recognisable. Pupation within the leaf, in a lower-surface
section of 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 de Meijere (1950)
and Hering (1954) ((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).
Yellow; posterior spiracles each with 12 well-defined bulbs, froming
an almost complete circle (Spencer,
Hosts in Great Britain & Ireland: Currently unknown.
of year - larvae:
July (Hering, 1957).
of year - adults: Currently unknown.
in Great Britain & Ireland: Added to the British checklist
by Gibbs (2006a).
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Distribution elsewhere: Widespread in continental Europe including Austria, Denmark, France, Germany
(Spencer, 1976: 482), Belarus,
Czech Republic, Estonia, Lithuania, Poland and Slovakia (Martinez
in Fauna Europaea).
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British and Irish Parasitoids in Britain and elsewhere: