1a corridor mine < 1 mm long, full depth; larva, with feet and chitinised head, soon too large for the mine, sticking out with its rear end; older larvae live free: Epermenia chaerophyllella

1b mine larger, upper-surface; larva a maggot => 2

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

2a mine a primairy blotch with conspicuous primary and secondary feeding lines: Euleia heraclei

2b corridor mine: Phytomyza sii