Leaf-miner:
An irregular linear mine (Spencer, 1972b: 55).
Strictly
upper-surface corridor; often the loops are so close that a secondary
blotch develops. The mine resembles a compact version of the one
of Phytomyza cirsii.
Frass at first in isolated grains, later in strings, not along the
sides but untidily scattered over 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 Hering (1955a). Posterior spiracles each
with 3 bulbs (Spencer, 1972b:
55).
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: July.
Time
of year - adults: August.
Distribution
in Great Britain and Ireland: Uncommon. Kent (Otford and Wrotham)
(Spencer, 1972b) and Warwickshire
(Sutton Park) (Robbins, 1991:
120); Cambridgeshire (NBN
Atlas). Distribution
elsewhere: Germany, Belgium (Scheirs,
de Bruyn and von Tschirnhaus, 1995), Austria, Czech Republic,
French mainland, Hungary, Lithuania and Poland (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.
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