Upper surface mine that finishes in the leaf sheath. Mine changes
direction at least twice. Frass in one large lump. Pupation in the
mine, usually in the leaf sheath (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 Nowakowski (1973). The larval thorax has both ventrally and dorsally, sometimes paired, protuberances. In this species the paired projections of the pronotum in the pupariuml stage penetrate the wall of the puparium as two conspicuous spines (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).
Posterior spiracles each with three, extended bulbs (Bladmineerders van Europa).
Hosts in Great Britain & Ireland:
of year - larvae:
March-June (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Somerset (Folly Farm) (Gibbs,
2002: 154) and Gloucester (Gibbs,
NBN Grid Map:
Distribution elsewhere: Widespread in continental Europe including Poland (Spencer,
1990: 352), Austria, Czech Republic and Germany (Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.