1a mine full depth; larva with chitinised head: Orthochaetes setiger

1b mine upper- or lower-surface; larva a maggot => 2

1c gallen etc => Tabellen voor alle parasieten per soort

2a mine more or less a blotch => 3

2b mine more a, possibly branching, corridor => 4

3a broad corridor, or primary blotch, but never a secondary blotch; primary and secondary feeding lines conspicuous: Trypeta immaculata

3b broad corridor, continued into a secondary bloth; feeding lines much less conspicuous: Liriomyza taraxaci

4a corridor(s) clearly associated with the midrib => 5

4b corridor independent of the midrib => 7

5a corridor overlying the midrib, with very broad, lobe-like branches => 3a

5b branches not that broad => 6

6a mine contains hardly any frass; larva at daytime (and puparium) in the extreme base of the hollow midrib: Ophiomyia pulicaria

6b much frass, in strings; larva without a fixed place; pupation outside the mine: Liriomyza strigata

6a pupation within the leaf; the front spiracula penetrate the epidermis => 7

6b pupation outside the mine: Phytomyza aposeridis

7a corridor lower- or (mostly) upper-surface, not associated with the leaf margin: Chromatomyia cf. syngenesiae

7b corridor invariably and entirely lower-surface, following the leaf margin over a large distance: Phytomyza monori