Linear mine, although the maze of galleries formed sometimes appears
to form a false blotch. Pupation internal, at the end of the mine
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).
Hosts in Great Britain & Ireland:
of year - mine: June-August.
of year - adults: May the following year.
in Great Britain & Ireland: Restricted to montane habitats
- Angus (Glen Doll and area) and Perth (Meall nan Tarmachan) (Bland,
NBN Grid Map:
elsewhere: Holaractic. Europe (Spencer,
1990: 99). No country names given in Spencer,
1990 or Martinez (2004 in Fauna Europaea).
recorded in Canada (Yukon Territory) (Spencer,
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: