Leaf
miner: Large blotch, begining at the leaf margin (there is no
accumulation of frass). The oldest part of the mine with a charcteristic,
wine red colour. Most of the frass is ejected through a narrow slit
in the leaf margin. The larva makes an discoidal cocoon within the
mine. Hibernation in the larval stage (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).
The larva is illustrated in British
leafminers.
Ripper
(1931a), Lorenz and Kraus (1957a), Lindquist (1959a) and Smith
(1971a) describe the larva. Thoracic feet reduced to stumps. Prosternum
with a large dark patch; meso- and metasternum with a small dark
spot. Pronotum with a large rectangular black sclerite. In the prepupal
stage, when the larva does not feed any more, all pigmentation has
disappeared (Bladmineerders van Europa).
Pupa:
The pupae of sawflies have visible head appendages, wings and legs which lie in sheaths.
The larva pupates in the mine in a disc structure (British
leafminers).
Hosts in Great Britain and Ireland:
Hosts
elsewhere:
Time
of year - larvae: Summer British
leafminers
Time
of year - adults: Currently unknown.
Comments:
Full synonymy and references are listed in ECatSym - Electronic World Catalog of Symphyta.
Distribution
in Great Britain and Ireland: Britain including Bedfordshire,
Buckinghamshire, Easterness, West Suffolk and Westmorland (NBN
Atlas).
Also
recorded in the Republic of Ireland (Fauna Europaea).
Distribution
elsewhere:
Widespread in continental Europe including Austria, Belgium, Czech
Republic, Estonia, Finland, French mainland, Germany, ? Italian
mainland, Kaliningrad Region, Latvia, Poland, Romania, Sweden, Switzerland,
The Netherlands and Ukraine (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere:
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