Leaf-mine: Oviposition near the leaf margin, in the distal half of the leaf. From here a narrow gallery of c. 15 mm runs to the leaf tip, then down again; then the gallery widens into a brown blotch that may occupy the entire width of the leaf. In the blotch the frass lies dispersed as black granules of variable sizes. Pupation external (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.
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).
About 1 mm, sausage shaped, pale orange brown, segment limits shallow. Front spiracula T-shaped; rear spircaula on two stout bases, touching each other at their feet, with 13-14 papillae in circular arrangement (Bladmineerders van Europa). Drawing in Proc. Trans. BENHS 24: 125 (2011).
Hosts in Great Britain & Ireland:
elsewhere: Currently unknown.
of year - mines: Bivoltine; occupied mines were found in late June and in the first half of September (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Described from Scotland in
2011 by Keith Bland.
NBN Grid Map:
elsewhere: Currently unknown
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.