Leaf-mine:
Very long, rather deep corridor, initially lower-surface, later
upper-surface. In smaller leaves almost always a secondary blotch
originates, that can occupy the entire leaf. Frass initially in
pearl strings, later in scattered aggregations. Pupation outside
the mine; exit slit in upper epidermis (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.
Yellowish. Mandibles with 2 teeth, alternating. Both anterior and
posterior spiracles two-horned, with 12-19 and 18-24 bulbs, respectively
(Beiger, 1972a; Spencer, 1971a).
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).
Black, smooth, without intersegmental depressions.
Hosts in Great Britain and Ireland: Currently unknown.
Hosts elsewhere:
Time
of year - mines: Currently unknown.
Time
of year - adults: Currently unknown.
Distribution
in Great Britain and Ireland: Added to the British checklist
by Henshaw in Chandler, 1998; North Somerset (NBN
Atlas). Distribution elsewhere: Widespread in continental Europe including the Bavarian Alps, the Polish Tartra
Mountains and central Sweden (Spencer,
1990: 231), Austria, Germany and Poland (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown. |