Leaf-mine: A strongly contracted upper-surface tentiform mine, generally in the lower third of the leaf, beginning at the leaf base. Often a second or third mine is made, starting from the leaf tip. These secondary mines begin as a narrow, almost completely frass-filled corridor, that continues down to the leaf base.al the while widening into a tentiform mine. Pupation outside the mine (Steuer, 1980a) (Bladmineerders van Europa).

Mines found in plants in open or semi-shade (British leafminers).

Larva: Head pale honey coloured, mouth-parts dark brown; prothoracic and anal plates and thoracic legs translucent yellowish green; body dull green, tinged yellowish ventrally (Langmaid, 2007a). Steuer (1980a) gives a detailed description, but it is not quite certain that this indeed refers to tengstromi (Bladmineerders van Europa).

Pupa: Details unknown.

Adult: Not illustrated in UKMoths (check for update). The genitalia are not illustrated by the Lepidoptera Dissection Group (check for update).

Hosts in Britain:

Hosts elsewhere:

Time of year - larvae: Larvae overwinter in mines, which slowly develop to June (British leafminers).

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Britain including Kent, Hampshire, Oxfordshire, Monmouthshire and Elgin (British leafminers).

NBN Grid map:

Distribution elsewhere: Widespread in continental Europe including Austria, Danish mainland, Estonia, Finland, Germany, Latvia, Norwegian mainland, Poland, Russia - North and Northwest, Sweden and Switzerland (Karsholt and van Nieukerken 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.