The first instar larva forms a shallow winding linear mine on the
underside of the leaf, later forming a broad upper surface mine
(Spencer, 1976: 436); initially
frass in a narrow central line which after the larva moves to the
upperside of the leaf is in irregular black lumps (Bladmineerders van Europa). Pupation internal (Spencer,
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).
The puparium is described by de Meijere (1928
and 1938a). Yellowish; posterior
spiracles each with 13-16 bulbs (Spencer,
Hosts in Great Britain & Ireland:
of year - larvae: June-August (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Phytomyza kaltenbachi
was restored to the British checklist by Henshaw in Chandler,
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Distribution elsewhere: Widespread in continental Europe including Austria, Denmark, Germany, Sweden
(Spencer, 1976: 436), European
Turkey, Poland and Switzerland (Martinez in Fauna Europaea).
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British and Irish Parasitoids in Britain and elsewhere: Currently unknown.