rather large, clear, partly full depth blotch that begins in the
axil of a thick lateral vein. Often the ovipostion leaves a greyish-green
scar. Generally several mines in a leaf. The mine expands within
the confines of the midrib and two lateral veins; only close to
the leaf margin, where the lateral veins are thin, the mine may
trespass over a vein (Bladmineerders van Europa).
mine is also illustrated in British
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 larvae have four spots - the anterior spots being large, which
distinguishes it from P.
leafminers). The larva is also illustrated in Bladmineerders van Europa.
The pupae of sawflies have visible head appendages, wings and legs which lie in sheaths.
Hosts in Great Britain & Ireland:
of year - larvae: Early Summer and early Autumn (British
of year - adults: Currently unknown.
Full synonymy and references are listed in ECatSym - Electronic World Catalog of Symphyta.
in Great Britain & Ireland: Britain including Bedfordshire (VC30),
Buckinghamshire (VC24), Denbighshire (VC50), Dorset (VC9), East Ross (VC106), East Sussex (VC14), Glamorganshire (VC41),
Merionethshire (VC48), North Wiltshire (VC7), Nottinghamshire (VC56), South Wiltshire (VC8),
Surrey (VC17), West Lancaster and West Suffolk (VC26) (NBN
Gateway). Mines and larvae recently recorded on Alnus, possibly glutinosa, in the Orkneys by Derek Mayes (pers. comm.) have been identified as Fenusa
recorded in the Republic of Ireland (van Achterberg in Fauna Europaea).
NBN Grid Map:
elsewhere: Widespread in continental Europe including Austria,
Azores, Belgium, Bulgaria, Czech Republic, Danish mainland, Estonia,
Finland, French mainland, Germany, Hungary, Italian mainland, Latvia,
Poland, Portuguese mainland, Romania, Russia - Central, Slovakia,
Spanish mainland, Sweden, Switzerland, The Netherlands and Ukraine.
Also recorded in the Nearctic region (van Achterberg in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: