An irregular linear mine (Spencer, 1972b: 55).
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:
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: July.
of year - adults: August.
in Great Britain & Ireland: Uncommon. Kent (Otford and Wrotham)
(Spencer, 1972b) and Warwickshire
(Sutton Park) (Robbins, 1991:
120); Cambridgeshire (NBN
NBN Grid Map:
elsewhere: Germany, Belgium (Scheirs,
de Bruyn and von Tschirnhaus, 1995), Austria, Czech Republic,
French mainland, Hungary, Lithuania and Poland (Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.