Eryngium sea holly, field eryngo
(For a dichotomous table for galls on Eryngium by Hans Roskam click here)
Dichotomous table for leafminers
1a larva with thoracic feet and chitinised head; mine for a large part in the rind of the stem => 2
1b larva a maggot; mine intirely in the leaf => 3
1c galls, etc => Tables for all parasites per species
Dichotomous table for leafminers
1a larva with thoracic feet and chitinised head; mine for a large part in the rind of the stem => 2
1b larva a maggot; mine intirely in the leaf => 3
1c galls, etc => Tables for all parasites per species
2a larva with prolegs: Stomopteryx detersella
2b no prolegs; only on E. amethystinum, campestre: Dibolia timida
3a blotch mine, may be preceded by a short broad corridor; feeding lines conspicuous: Euleia heraclei**
3b corridor mine => 4
4a puparium in the mine, usually in an lower-surface pupal chamber; frass in isolated grains: Chromatomyia horticola
4b puparium formed after the mine has been vacated; frass in strings or absent => 5
5a corridor short, not strongly branched, almost without frass: Euleia heraclei**
5b corridor pinnately branched or branches fanning out from the leaf basis: Liriomyza strigata
** Eryngium is an unsuitable host plant for Euleia heraclei and most larvae die early, before they have formed a blotch.
Not included in the key: Dibolia chevrolati, cryptocephala, phoenicia; Tebenna micalis.