Leaf-mine: Mine narrow, irregular linear; initially on lower surface but mainly upper surface. Pupation internal (Spencer, 1972: 87).

Initially lower-surface, later upper-surface corridor, not appreciably widening towards the end. Corridor often strongly contorted. Frass in rather coarse grains, irregularly scattered. Pupation in the mine (Bladmineerders van Europa).

Larva: The larva is described by de Meijere (1926, as Phytomyza sp. on Aster tripolium); de Meijere (1928); de Meijere (1934, as Ph. tenella) and Griffiths (1976c).

Puparium: Whitish; posterior spiracles each with a circle of up to 25 bulbs (Spencer, 1976: 388).

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: July-October.

Time of year - adults: July or January the following year.

Distribution in Great Britain and Ireland: Widespread around coasts. Records for Britain include Kent (Faversham) (Spencer, 1972: 87), Stirling (Higginsneuk) and North Uist (Oban Trumisgarry) (Bland, 1994c: 83) and East Kent, East Suffolk, Glamorgan and West Norfolk (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. Clare (Dunratty and Poulnaclough Bay) and Co. Down (Corlingford Loch) (Spencer, 1972: 87).

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, France, Germany (Spencer, 1976: 388), The Netherlands, Belgium (Kabos, 1971; Collart, 1942), Czech Republic, Poland, Slovenia and Sweden (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.