Fenusa ulmi Sundevall, 1847.
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Leaf
miner: Very clear blotch, containing a yellow white larva. The final mine may occupy a sizable part of the leaf. The mine usually starts in a vein axil, never at the leaf margin (Liston, 1994a); in large leaves the mine remains confined between to lateral veins. Frass in black grains, initially often in long pearl chains, in older mines in loose grains. (Bladmineerders van Europa).
The
mine is also illustrated in British
leafminers.
Larva:
The larvae of sawflies have a head capsule, chewing mouthparts with opposable mandibles, six thoracic legs and abdominal legs (although they may be reduced) (see examples).
Normally the larva lies venter-upwards in the mine. The small warts on segment 9, and frontal of the rearmost prolegs, are practically unpigmented in some specimens! (Bladmineerders van Europa.
Pupa:
The pupae of sawflies have visible head appendages, wings and legs which lie in sheaths.
Adult: Details unknown.
Hosts in Great Britain and Ireland:
Hosts
elsewhere:
Time
of year - larvae: Mines in May-June, sometimes numerous (Bladmineerders van Europa).
Time
of year - adults: Currently unknown.
Distribution
in Great Britain and Ireland: Widespread in Britain incluidng Caernarvonshire, Cambridgeshire, Denbighshire, Derbyshire, East Gloucestershire, East Kent, East Ross, Easterness, Flintshire, Glamorgan, Leicestershire, Main Argyll, Mid-west Yorkshire, North-west Yorkshire, Nottinghamshire, South-east Yorkshire, South-west Yorkshire, Surrey, West Gloucestershire, West Ross and Westlmorland (NBN
Atlas)
Distribution
elsewhere: Widespread in continental Europe including Austria,
Belgium, Croatia, Czech Republic, Estonia, Finland, French mainland, Germany, Italian mainland, Latvia, Poland, Slovakia,
Sweden, Switzerland, and Ukraine (Fauna Europaea).
British and Irish Parasitoids in Britain and elsewhere:
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