Clematis traveller’s joy

Dichotomous table for leafminers

1a blotch => 2

1b corridor => 6

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

2a larva a maggot; on Clematis cirrhosa: Phytomyza cirrhosae

2b larva with thoracic feet and chitinised head; on other hostplants => 3

3a larva with prolegs; mine full depth, very transparent => 4

3b no prolegs; mine not entirely full depth, greenish when lighted from behind => 5

4a on Clematis alpina: Pseudodineura clematidis

4b on Clematis recta: Ps. clematidisrectae

5a eastern European species: Argopus nigritarsis

5b more a species of central and western Europe: Argopus ahrensi, brevis

6a corridor short, ending upon a thick vein or into the leaf base => 7

6b corridor much longer => 8

7a on Clematis flammula or recta: Ptochomyza mayeri

7b on othe species: Phytomyza clematidis

8a mine begins wth a densely wound, intestine-like, upper-surface corridor: Phytomyza anemones

8b mine begins with very long and narrow lower-surface part, that several times crosses the leaf: Phytomyza kaltenbachi

8c mine begins with a knot or spiral, or a short lower-surface corridor (may be along the midrib) => 9

9a lower-surface section mostly a densely wound spiral => 10

9b lower-surface section a corridor of a few mm => 12

10a frass in two rows; corridor not associated with the leaf margin; northern Europe and the mountains of central Europe: Phytomyza pulsatillae

10b frass in pearl chains of strings at one side of the corridor; parts of the corridor follow the leaf margin; south and central European lowlands => 11

11a lower-surface section a more or less tortuous, epidermal, silvery corridor with a fine black frass line: Phytomyza dalmatiensis

11b lower-surface section a dense knot in the sponge parenchyma, finally forming a small full depth transparent patch: Phytomyza rectae

12a frass in long threads that over long tracks lie at the same side of the corridor; mine usually begins in the tip of a leaflet; in upper-surface part of the mine the corridor sides are smooth: Phytomyza vitalbae

12b frass in pearl chains, alternating along the sides of the mine, sometimes almost seeming central; mine less often beginning in the tip of a leaflet; corridor sides in upper-surface part of the mine irregularly eaten out: Phytomyza fulgens

Not included in the key: Phytomyza actaeae.

mod 9.x.2017