1a fleck mine; larva mines from a case => 2

1b mine upper- or lower-surface; larva a maggot => 3

1c mine full depth; larva with chitinised head => 6

1d galls, etc => Tables for all parasites per species

2a brownish black sheath case: Coleophora caelebipennella

2b light coloured tubular silken case: Coleophora gnaphalii

3a pinnately branched corridor, main branch positioned over the midrib: Liriomyza strigata

3b mine consists of several corridors that radiate from the base into the leaf: Ophiomyia gnaphalii

3c mine not associated with leaf base or midrib => 4

4a mine a corridor until the end; pupation in the leaf in a, usually lower-surface, pupal chamber: Chromatomyia cf. syngenesiae

4b mine strongly widened towards the end; larva leaves the mine prior to pupation through a semicircular exit slit => 5

5a blotch, preceded by a lower-surface gallery: Phytomyza kyffhusana

5b gallery throughout (subtropical exotic species): Liriomyza trifolii

6a larva without feet: Orthochaetes insignis

6b larva with thoracic feet => 7

7a mine small, larva grey: Cnephasia incertana

7b mine not unusually small; larva not grey => 8

8a mine (partly) a gallery => 9

8b blotch => 10

9a a gallery, initially very fine, until the end: Bucculatrix gnaphaliella

9b gallery locally and terminally strongly widened: Digitivalva reticulella

10a mine with copious amounts of frass: Tebenna micalis

10b mine almost without frass => 11

11a the larve mines from a silken tube on the ground: Scrobipalpula psilella

11b no silken tube => 12

12a larva bluish white, with three yellow, later red length line: Scrobipalpa murinella

12b larva yellow with five red length lines [teste Hering, 1957a]; high alpine species: Scrobipalpula diffluella