Leaf-mine: Upper-surface corridor, generally in the upper half of the blade, running up to the leaf tip, usually occupying more then half the width of the leaf. Frass in green stripes at either side of the corridor. Never more than one larva in a mine. Puparium within the mine, metallic black, not anchered with a string of silk (Bladmineerders van Europa).

Larva: Posterior spiracles laterally with a large, finely spinulose wart that almost hides the trachea behind it. The two rear arms of the cephalic skeleton dark for most of their length (Nowakowski, 1973a).

Puparium: Metallic black, deeply segmented; posterior spiracular processes generally as in Cerodontha incisa, but with the 3 bulbs more elongate, the lower two curving around the base of the hook-like upper one (Spencer, 1976: 195).

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: June-August (Bladmineerders van Europa).

Time of year - adults: July-August.

Distribution in Great Britain and Ireland: Widespread in Britain - Norfolk (Blakeney and Winterton) and Elgin (Culbin Sands) (Spencer, 1972: 104); Glamorgan (NBN Gateway - 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).

NBN Grid map:

Distribution elsewhere: Widespread in continental Europe including Denmark, Sweden, Germany, Poland and Russia (Spencer, 1976: 185), Czech Republic, French mainland, Hungary, Lithuania, Slovakia, Spanish mainland and Ukraine (Martinez in Fauna Europaea).

Also recorded in Canada and the U.S.A. (Spencer, 1976: 185).

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

Parasitoids in Britain and elsewhere: Unknown.