The larvae of the Agromyzid fly Phytomyza marginella produce a corridor mine in the leaves of various plants including Dandelion. The first part consists of a very long and narrow lower-surface corridor; the mine is quite shallow here, and often inconspicuous. The second part is upper-surface, usually much shorter, and widens abruptly.
Wherever any of the host species occur.
Mines can usually be found in summer and autumn.
Larva may be present between June and October. Pupation outside the mine.
Status in Britain is difficult to determine due to lack of records.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015