Acleris effractana
Acleris effractana
Adult • South Uist, Outer Hebrides • © Chris Johnson

BF1062a
Acleris effractana

(Hübner, 1799)

[Synonyms: stettinensis]

Wingspan c. 22mm. In the 19th Century, this was regarded as a separate species, but later became known as a form of A. emargana. Recently though it has been granted full specific status again, based on consistent genitalia and external differences. Compared with emargana, it tends to be less variable, with a shallower 'emargination' on the forewing costa, and with small groups of raised blackish scales (rather than whitish on similar emargana specimens). However, to be certain of identification, it is best to refer to dissection of the genitalia. Flying between July and October, It has a northerly European distribution, occurring in Britain mainly in Scotland, where it is widespread. The larvae feed amongst spun leaves of purple willow (Salix purpurea) and grey willow (S. cinerea) in Britain. Gen. preps (Dissection Group website):

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