Arrhenatherum oat-grass
(For a dichotomous table for galls on Arrhenatherum by Hans Roskam click here)
Dichotomous table for leafminers
1a mine full depth; larva with feet and chinitinised head; pupation outside the mine (Elachista) => 2
1b mine upper-surface; larva a maggot; pupation within or outside the mine => 3
1c galls, etc => Tables for all parasites per species
Dichotomous table for leafminers
1a mine full depth; larva with feet and chinitinised head; pupation outside the mine (Elachista) => 2
1b mine upper-surface; larva a maggot; pupation within or outside the mine => 3
1c galls, etc => Tables for all parasites per species
2a of too many Elachista‘s the mines and larvae are badly known, and a key cannot be made. According to literature the following species occur on this host plant: Elachista albifrontella, apicipunctella, bedellella, canapennella, maculicerusella, nobilella, pullicomella, rufocinerea, subalbidella
3a larva: mandible with 1 tooth; rear spiraculum drawn into a slender point: Hydrellia griseola
3b mandible with 2 or more teeth; rear spiraculum not pointed (Agromyzidae) => 4
4a larve: cephalic skeleton of Agromyzinae-type; pupation outside the mine ** => 5
4b cephalic skeleton of Phytomyzinae-type; pupation within or outside the mine => 8
5a larva: behind the mandibles ventrally a field with spinulose warts; mandible with 2-3 teeth => 6
5b no such field; mandible with 4 teeth (only occasionally on this host plant): Agromya albipennis
6a larva: mandible with 3 teeth (the basal one clearly smaller than the apical two): Agromyza nigrociliata
6b mandible with 2 teeth => 7
7a larva solitary; rear end of blunt: Agromyza rondensis
7b larvae communal; rear end of cut off obliquely: Agromyza nigrella / A. mobilis
8a puparium in the mine => 9
8b pupation outside the mine => 11
9a puparium metallic black; spiracula not penetrating the epidermis: Cerodontha pygmaea
9b puparium orange-brown; front spiracula penetrating => 10
10a puparium monochromous; front spiracula somewhat bifid: Chromatomyia nigra
10b puparium with a ventral dark length band; front spiraculum fist-shaped: Chromatomyia fuscula
11a larva: rear spiraculum with 3 papillae: Liriomyza flaveola
11b rear spiraculum with 5-11 papillae => 12
12a larva: rear spiraculum with 5-7 papillae; October: Liriomyza pusio
12b rear spiraculum with 6-8 papillae; April-September: Liriomyza phryne
12c rear spiraculum with 9-11 papillae; May-September (occurrence on this plant not quite certain): Liriomyza graminivora
** See also the key to grass-inhabiting Agromyza-larvae.
Not included in the key: Pseudonapomyza atra.