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Leaf-miner: A narrow linear mine which can develop into a secondary blotch (Spencer, 1976: 517).

Upper-surface mine in the tip of a leaf segment in primary corridor, but quickly turning into secondary blotch within the limited space of the leaf segment. The mine begins in the very tip of the segment, this initial section later becomes unrecognisable. Frass in fine granules. 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 de Meijere (1926). Posterior spiracles each with approx. 22 bulbs.

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).

Black; posterior spiracles each with some 22 bulbs (Spencer, 1976: 517).

Hosts in Great Britain and Ireland:

Apiaceae
Peucedanum	palustre	Milk-parsley		Irwin in Chandler, 1985: 103

Hosts elsewhere:

Apiaceae
Peucedanum				Spencer, 1990: 160
Peucedanum	palustre	Milk-parsley		Spencer, 1976: 517
Peucedanum	palustre	Milk-parsley		Bladmineerders van Europa
Selinum	carvifolia	Cambridge Milk-parsley		Spencer, 1976: 517
Selinum	carvifolia	Cambridge Milk-parsley		Bladmineerders van Europa

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

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Recorded as new to Britain by Irwin (1985: 103). Known from Cambridgeshire and East Norfolk (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including Germany, Norway, Poland, Sweden (Spencer, 1976: 517), The Netherlands (Bladmineerders van Europa), Hungary and Lithuania (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: