Potentilla cinquefoil

Dichotomous table for leafminers

Incl. Argentina anserina. Also Duchesnea indica, the mock strawberry, is currently included in Potentilla. See also Comarum and Drymocallis. For Potentilla fruticosa see Dasiphora.

1a blotch, no trace of a preceding corridor => 2

1b corridor, may widen into a blotch => 6

1c fleck mine; larva in a lobe case => 15

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

2a the blotch soons turns into an elliptic excision: Incurvaria praelatella

2b no excision is made => 3

3a mine tiny; larva yolk-yellow: Spialia sertorius

3b mine larger; larva not yellow => 4

4a on the oviposition spot, usually near the leaf margin, a shining black drop of dried secretion: Trachys fragariae

4b no such drop => 5

5a larva: no claw at the end of the feet; common species: Fenella nigrita

5b the feet end in a distinct claw; only known from Hungary on P. cinerea: Fenella arenariae

6a mine begins at a globular, shining egg shell => 7

6b no egg shell visible => 13

7a mine begins with a strongly contorted corridor: Ectoedemia arcuatella

7b initial corridor not contorted => 8

8a mine remains a gallery till the end => 9

8b gallery widens into an irregular, often large, blotch => 11

9a egg at the underside of the leaf: Stigmella thuringiaca

9b egg at the upperside (rarely underside, but the gallery then very slender) => 10

10a frass in the first section of the gallery diffuse, greyish green: Stigmella anomalella

10b frass black and granular, also in the first section: Stigmella splendidissimella

11a egg at the upperside: Stigmella poterii

11b egg at the underside => 12

12a lowland species: Stigmella aeneofasciella

12b always, or almost always, high in the mountains: Stigmella stelviana (always) & Stigmella tormentillella (almost always)

13a initial corridor short, quickly widening; mine full depth; larva with chitinised head => 5

13b initial corridor longer and/or widening more slowly; mine upper- or lower-surface; larva a maggot => 14

14a frass in the corridor part in two rows of grains; larva: rear spiraculum with 3 papillae: Agromyza idaeiana

14b initial corridor almost full of frass; rear spiraculum with 6 papillae: Agromyza sulfuriceps

15a case helicoidal; opening of the mine not neatly circular: Apterona helicoidella

15b case more or less straight; opening a perfect circle => 16

16a spatulate leaf case: Coleophora albicostella

16b lobe case => 17

17a case brown; lobes of the case cut out of the upper epidermis; mouth angle 0°-10°: Coleophora violacea

17b case whitish; lobes cut out of the lower epidermis; mouth angle 20°-30°: Coleophora potentillae

Not included in the key: Coleophora ahenella, sergiella, vitisella; Sophronia humerella; Tinagma perdicella.

mod 9.x.2017