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

1b mine upper- or lower-surface, greenish when lighted from behind; larva a maggot => 2

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

2a blotch mine, with conspicuous secondary feeding lines: Euleia heraclei

2b long, irregular, corridor; no recognisable feeding lines: Phytomyza smyrnii