Blotch, near the leaf tip, containing one or two larvae; 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 Darvas, Skuhravá and Andersen
(2000); mandible with 2 teeth; front spiraculum with 8, rear spiraculum with 3 bulbs. The bulbs of the rear spiraculum are elongated and S-shaped, like in cinerascens and intermittens (d'Aguilar, Chambon and Touber, 1976a) (Bladmineerders van Europa).
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).
Reddish-brown, but the anterior segments are noticeably darkened,
almost blackish; posterior spiracles each with 3 bulbs, the two
processes separated by approximately their own diameter (Spencer,
Hosts in Great Britain & Ireland: Currently unknown.
of year - larvae: Currently unknown. There is apparently only one generation
per year (Spencer, 1976:
of year - adults: Currently unknown.
in Great Britain & Ireland: Added to British checklist by
Cole in Chandler (1998:
136). Recorded from Cambridgeshire (NBN
recorded in the Republic of Ireland (Martinez in Fauna Europaea).
elsewhere: Widespread in continental Europe. Described from
northern Italy. Recorded in Denmark, Sweden, Finland (Spencer,
1976: 121), Germany (von
Tschirnhaus, 1999), Austria, Czech Republic, Lithuania, Slovakia,
Spanish mainland and The Netherlands (Martinez in Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.