Leaf
miner: Oviposition at the underside of a thick vein. From this point the
larva makes a corridor that quickly widens into a full depth blotch,
mostly in the distal half of the leaf. Frass initially in a central
line, further on in scattered lumps (Bladmineerders van Europa).
There
is normally one mine per leaf (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).
Shaped like a normal caterpillar, not much flattened, with a globular head and the mouth directed vertically (Bladmineerders van Europa).
Pupa:
The pupae of sawflies have visible head appendages, wings and legs which lie in sheaths.
Pupation outside the mine (Bladmineerders van Europa).
Adult:
The adult is illustrated in ECatSym - Electronic World Catalog of Symphyta.
Hosts in Great Britain and Ireland:
Hosts
elsewhere:
Time
of year - larvae: April-May (British
leafminers).
Time
of year - adults: Females emerge from the end of March to the
middle of April (depending on weather conditions) (British
leafminers).
Comments:
Full synonymy and references are listed in ECatSym - Electronic World Catalog of Symphyta.
Distribution
in Great Britain and Ireland: Denbighshire (NBN Atlas).
Distribution elsewhere: Widespread in continental Europe including Estonia, Finland, Germany, Latvia,
Poland, Romania and Sweden (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere:
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