1a fine gallery that ends upon a thick vein; from there the larva descends through the petiole, to make a gallery mine in the bark of the stem: Ophiomyia curvipalpis

1b mine entirely within the leaf => 2

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

2a mine for most of its length within or on top of the midrib and main lateral veins => 3

2b mine independent of the leaf venation => 5

3a mine a gallery on top of the midrib and thick side veins; frass in distinct thread fragments; pupation external: Liriomyza strigata

3b the larva spends most of its time within the hollow midrib, from there making short excursions into the leaf disk; the larva rests in the very base of the midrib; there most of the frass is concentrated, and there also pupation takes place => 4

4a larva: front spiraculum spine-like, erect: Ophiomyia pulicaria

4b front spiraculum broad, bent: Ophiomyia beckeri

5a blotch mine: Liriomyza sonchi

5b gallery => 6

6a first section of the gallery exceptionally long and lower-surface, final part upper-surface; pupation external: Phytomyza marginella

6b mine not unusually long, generally upper-surface; pupation internal, in a, usually lower-surface, pupal chamber: Chromatomyia syngenesiae