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Leaf-mine: Larva initially forms a narrow lower surface linear mine, later producing a large blotch, frequently adjoining the leaf-margin on the upper surface. Several larva can feed together (Spencer, 1976: 269).

Upper-surface blotch at the leaf margin, preceded by a lower-surface corridor. Most frass in the centre of the blotch. Often several larvae in a mine. Primary and secondary feeding lines well visible. Pupation outside 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 (1967, as scariolae).

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).

Orange-yellow; posterior spiracles each with an ellipse of some 8 bulbs (Spencer, 1976: 269).

Hosts in Great Britain and Ireland: Currently unknown.

Hosts elsewhere:

Asteraceae
Lactuca				Spencer, 1990: 259
Lactuca	serriola	Prickly Lettuce		Bladmineerders van Europa
Scorzonera				Spencer, 1990: 259
Scorzonera	humilis	Viper's-grass		Spencer, 1976: 269
Scorzonera	humilis	Viper's-grass		Bladmineerders van Europa

Time of year - mines: May and August-September (Hering, 1957).

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Added to British Checklist by Henshaw in Chandler, 1998: 138.

Distribution elsewhere: Widespread in continental Europe including Poland (Spencer, 1976: 269), Sweden (Spencer, 1976: 269; Bladmineerders van Europa), Czech Republic, Estonia, French mainland, Germany, Lithuania, Poland and Spanish mainland (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: