Scabiosa small scabious
Dichotomous table for leafminers
1a large tentiform mine: Phyllonorycter scabiosella
1b fleck mine => 2
1c mine transparant, full depth; larva with chitinised head => 4
1d mine upper- or lower-surface; larva a maggot => 5
1e galls, etc. => Tables for all parasites per species
2a larva mines from a long silken tube that is attached to the plant: Scythris siccella
2b larva mines from a transportable case => 3
3a cas helicoidal; hole in the mine not precisely round: Apterona helicoidella
3b case tubular; hole in the mine neatly round: Coleophora paripennella (occurrence on this host needs confirmation)
4a at the point of oviposition a shining black drop of dried secretion; pupation in the mine: Trachys troglodytes
4b no black drop; older larva leaves the mine and continues feeding between spun leaves or from a silken tube: Rhopobota stagnana
5a mine not associated with the midrib => 6
5b corridors radiate from the midrib, or pinnately branched corridor overlays it => 10
6a frass almost absent, or a few large lumps near the end of the corridor; puparium outside the mine; often a secondary blotch: Aulagromyza similis
6b frass present as grains or strings; puparium in the mine => 7
7a corridor long, in the distal half of the leaf; mine turns the surrounding leaf violet: Chromatomyia succisae
7b corridor shorter, no preferred position, no discolouring => 8
8a frass in more or less long threads; corridor contorted => 9
8 frass in isolated grains; corridor not contorted: Chromatomyia horticola
9a frass in strings of short threads: Chromatomyia scabiosae
9b frass in a more or less continuous thread: Chromatomyia scabiosella
10a corridors in the leaf disc radiating all from the basal half of the midrib: Chromatomyia ramosa
10b corridor pinnately branched, main branch overlying the midrib => 11
11a puparium in the mine: Chromatomyia scabiosarum
11b puparium external: Liriomyza strigata
Not included in the key: Trachys troglodytes subglaber.