Mine linear and winding in upper surface. Pupation in the mine (Spencer, 1972b: 88).
corridor, loops closely together. Frass in thread fragments or pearl
string, seemingly lying in a central line. Pupation within 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 (1937).
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).
White, grey or shining black (Spencer, 1972b: 88).
Hosts in Great Britain & Ireland:
of year - mines: September (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Local. Surrey (Chipstead) (Spencer, 1972b: 88). (NBN Gateway).
elsewhere: Northern Germany (Spencer,
1954), Poland and Spanish mainland (Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: