Larva feeds as an internal stem-borer (Spencer,
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 larvae lie on their sides within the mine and use their pick-like mouthparts to feed on plant tissue.
Mandibles with one large and one small tooth (Spencer,
1976: 52, fig. 41); posterior spiracles virtually adjoining,
each with an ellipse of some 15 bulbs around a strong central horn
(Spencer, 1976: 51).
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).
Greyish-white (Spencer, 1976:
Spencer (1966a: 21) and
Spencer (1972b: 16, 19,
111, 112) misidentifed British specimens of oligophaga as dettmeri.
Hosts in Great Britain & Ireland: Currently unknown.
of year - larvae: Currently unknown.
of year - adults: Currently unknown.
in Great Britain & Ireland: Britain including Cheshire (VC58),
Denbighshire and Flintshire (NBN
elsewhere: Widespread in continental Europe including Denmark
(Spencer, 1990: 394), Belarus,
Czech Republic, French mainland, Latvia, Lithuania, Poland, 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: