Juncus rush
Dichotomous table for leafminers
1a at the oviposition site a shiny oval, blackish-brown drop of dried secretion => 2
1b no such drop => 3
1c galls, etc => Tables for all parasites per species
2a the most common species, occuring furthest words the NW; on various Juncus-soorten species: Aphanisticus emarginatus
2b Mediterranean region, on Juncus subulatus: Aphanisticus angustatus
2c Mediterranean region, on Juncus acutus: Aphanisticus distinctus
2d Mediterranean region, perhaps on Juncus acutus: Aphanisticus pygmaeus
3a larva with feet and chitinised hea => 4
3b larva a maggot => 7
4a larva: eye is only 1 facet (sawfly larva): Eutomostethus luteiventris
4b eye composed of several facet (Lepidoptera larva) => 5
5a larva exceptionally slender: Ochsenheimeria bubalella
5b larva with normal proportions => 6
6a larva with brown head; frass in a dark mass in the middle of tje mine: Elachista scirpi
6b larva with black head; frass concentrated in the lowest part of the mine, light green at first, later grey: Elachista utonella
7a very fine gallery, spiralling around rhe base of the leaf: Hydrellia nigricans
7b rather broad, irregular gallery running lengthwise through the leaf => 8
8a larva with 8 pairs of spiracula and with transverse ridges over the , armed with small hooks: Thrypticus bellus
8b larva with 2 pairs of spiracula, without transverse ridges => 9
9a puparium in the mine; Juncus effusus: Cerodontha luctuosa
9b pupation outside the mine; Juncus gerardi: Metopomyza junci
Not included in the key: Elachista carinisella.