Leaf-mine: A long linear greenish-white mine which can conspicuously widen at end, with frass in separate grains (Spencer, 1972: 81, 83 (figs 264-5); Spencer, 1976: 522, 523 (fig. 915).

Upper-surface, quite long corridor with irregular sides, in the end about 4 mm wide. Frass in discrete grains, alternating along the sides. Pupation outside the mine; exit slit in upper epidermis (Bladmineerders van Europa).

A long narrow mine, widening at the end and often forming a secondary blotch (British leafminers).

Larva: The larva is described by Griffiths (1972) and Dempewolf (2001: 198); posterior spiracles each with 25-31 bulbs. The larva is illustrated in (Bladmineerders van Europa).

Puparium: The puparium is described by Griffiths (1972). Black; posterior spiracles each with an ellipse of 25-30 minute bulbs (Spencer, 1976: 522).

Hosts in Britain: Petasites fragrans (Winter Heliotrope), P.hybridus (Butterbur), Tussilago farfara (Colt's-foot)

Hosts elsewhere:

Time of year - mines: June-August.

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Widespread. Surrey (Box Hill), Derby (Miller's Dale), Denbighshire (Cefn-y-bedd) (Spencer, 1972: 81), Warwickshire (Hawkesbury) (Robbins, 1991: 110); Herefordshire
North Essex, North Lincolnshire, Radnorshire, Shropshire, South-west Yorkshire and Stafford (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 in the Republic of Ireland: Co. Tipperary (Tipperary) (Spencer, 1972: 81).

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 Denmark, Finland, Sweden, [former] U.S.S.R. (Spencer, 1976: 522), The Netherlands (Bladmineerders van Europa), Germany (Spencer, 1976: 522; Dempewolf, 2001: 198), Austria, Czech Republic, French mainland, Italian mainland, Poland and Romania (Martinez in Fauna Europaea).

Also recorded in Alaska and Canada (Spencer, 1976: 522).

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

Parasitoids in Britain and elsewhere: