miner: Large blotch, starting from the leaf margin. The very first triangular
part of the mine is filled with a dense mass of frass, caused by
lateral movements of the larva that actually press the frass in
this first mine segment. The mine seems full depth, but actually
is upper-surface, abeit very deep and (fresh) only very weakly greenish.
Pupation outside the mine (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 larva is intially green and then turns a dark yellow colour
towards maturity (British
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.
The adult is illustrated in ECatSym - Electronic World Catalog of Symphyta.
Hosts in Great Britain & Ireland:
of year - larvae: Summer and 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),
Berkshire (VC22), Buckinghamshire (VC24), Derbyshire (VC57), South Lancashire (VC59), South-east Yorkshire (VC61), Surrey (VC17), Warwickshire and West Suffolk (VC26) (NBN
Gateway, as Messa nana).
recorded in the Republic of Ireland (van Achterberg in Fauna Europaea).
NBN Grid Map:
elsewhere: Widespread in continental Europe including Austria,
Belgium, Bulgaria, Czech Republic, Danish mainland, Finland, French
mainland, Germany, Luxembourg, Norwegian mainland, Poland, Romania,
Russia - Central, Sweden and The Netherlands (van Achterberg in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Unknown.