Leaf-mine: Mine irregularly linear, whitish, distinctly widening, most frequently on lower leaves. Pupation external (Spencer, 1972: 79).

Long, slender corridor, gnerally upper-surface with a lower-surface beginning. Frass in irregular, but not conncted, grains. Pupation outside the mine (Bladmineerders van Europa).

A long, irregular galley which widens distinctly, upper surface, but often starting lower surface and sometimes forming a secondary blotch. Most frequently on lower leaves (British leafminers).

Larva: The larva is described by Hering (1954); posterior spiracles each with 18-20 bulbs.

Puparium: Black; posterior spiracles each with an irregular ellipse of some 20 bulbs (Spencer, 1976: 440).

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: August.

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Widespread but local. Surrey (Box Hill), Hertfordshire (East Barnet), Perthshire (Killin) (Spencer, 1972: 79), Berkshire (Dinton Pastures), Hampshire (Fleet) (British leafminers), Warwickshire (Foleshill) (Robbins, 1991: 116); Cambridgeshire, South-west Yorkshire and Surrey
(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).

Also recorded from Oxeye Daisy (Leucanthemum vulgare), 12 June 1985 at Castlecurragh, Co. Limerick, Ireland (H.C.J. Godfray).

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 and not uncommon in many parts of Europe including Norway, Sweden (Spencer, 1976: 440), The Netherlands (Bladmineerders van Europa), Germany (Spencer, 1976: 574), ? Albania, Czech Republic, Denmark, French mainland, Latvia, Lithuania, Poland and Slovenia (Martinez 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.