Leaf mine: 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).

The mine is also illustrated in British leafminers.

Larva: 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.

Pupa: Details unknown.

Adult: The adult is illustrated in ECatSym - Electronic World Catalog of Symphyta.

Hosts in Britain:

Hosts elsewhere:

Time of year - larvae: Summer and Autumn (British leafminers).

Time of year - adults: Unknown.

Comments: Full synonymy and references are listed in ECatSym - Electronic World Catalog of Symphyta.

Distribution in Great Britain & Ireland: Britain including Bedfordshire, Berkshire, Buckinghamshire, Derbyshire, South Lancaster, South-east Yorkshire, Surrey, Warwickshire and West Suffolk (NBN Gateway, as Messa nana - N.B. includes Watsonian Vice Counties having publicly available records that fall within or overlap the vice county border at 10km resolution or better i.e. a record for a vice county may relate to an adjacent vice county - for included datasets see NBN Grid map below).

Also recorded in the Republic of Ireland (van Achterberg in Fauna Europaea).

NBN Grid map: Note that not all datasets on the NBN Gateway may be available on the map below. If you are an NBN Gateway registered user you can request access for missing datasets via the link 'Open interactive map in new window' below.

Distribution 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 distribution map(s) of known host species in Great Britain and Ireland and elsewhere:

Parasitoids in Britain and elsewhere: Unknown.