and stem feeder / Leaf-miner: The
larva first tunnels in the rootstock and the stem. From there long,
untidily delineated corridors are made into the leaves. Pupation
in the underground parts of the plant (Bladmineerders van Europa).
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.
Described by de Meijere (1940b). Rear spiracula on a common
black spot, each with about 20 bulbs; mandible with 2 teeth (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).
Robbins (1990:130) records Delina nigrita on Orchidaceae,
but the description he gives of the mine as an 'irregular corridor,
mostly alonside the midrib and with fairly long-sided spurs' does
not agree with the description given in Bladmineerders van Europa.
Hosts in Great Britain & Ireland: Currently unknown.
of year - mines:
Larvae in June-July (Hering, 1957a) (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland:
Widespread in Britain including Cambridgeshire (VC29), East Norfolk (VC27), East Ross (VC106), Easterness (VC96), Herefordshire (VC36), Mid-west Yorkshire (VC64), North Ebudes (VC104),
Pembrokeshire (VC45), Stirlingshire (VC86), Warwickshire (VC38), West Lancashire (VC60), West Norfolk (VC28),
West Suffolk (VC26), Westmorland (VC69), Worcestershire (VC37) (NBN
recorded in the Northern Ireland and the Republic of Ireland (de Jong in Fauna Europaea).
NBN Grid Map:
elsewhere: Widespread in continental Europe including Austria, Czech Republic, Danish mainland, Estonia,
Finland, Germany, Lithuania, Norwegian mainland, Poland, Russia
(North), Slovakia, Spanish mainland, Sweden, Switzerland, The Netherlands
and the East Palaearctic (de Jong in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: