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Leaf-miner: Larva forms a short linear mine at edge of frond segment. Mines practically identical to those of P. hilerella which may be distinguished from P. pteridii by the male genitalia. Pupation external.

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).

Brownish-orange, deeply segmented; posterior spiracles on short conical projections, each with an ellipse of 12-15 bulbs.

Hosts in Great Britain and Ireland:

Dennstaedtiaceae
Pteridium	aquilinum	Bracken		Spencer, 1973b: 315
Pteridium	aquilinum	Bracken		Robbins, 1991 : 20
Pteridium	aquilinum	Bracken		Reared adults in BMNH

Hosts elsewhere:

Time of year - mines: April.

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Included in Robbins (1991: 20) from the 'north'.

Also recorded in the Republic of Ireland (Fauna Europaea).

Distribution elsewhere: Widespread in continental Europe including Germany (Berlin), Yugoslavia (Montenegro and Kolasin) and Slovenia (Postojna) (Spencer, 1973b: 315), Poland and Portuguese mainland (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: Currently unknown.