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 & Ireland:
of year - mines: April.
of year - adults: Currently unknown.
in Great Britain & Ireland: Included in Robbins (1991:
20) from the 'north'.
recorded in the Republic of Ireland (Martinez in Fauna Europaea).
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Distribution elsewhere: Widespread in continental Europe including Germany (Berlin),
Yugoslavia (Montenegro and Kolasin) and Slovenia (Postojna) (Spencer,
1973b: 315), Poland and Portuguese mainland (Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.