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This genus of four species is recognised by the presence of a forewing appendix. This is an entirely membranous area at the wingtip which is not bisected by any veins. The species are very similar; identification is complicated by the existence of different colour forms and ideally requires dissection of the male sternal apodemes (song apparatus).
In A. wahlbergi, there are no dark spots at the bases of the tibial spines. Very similar to A. coryli which is associated with hazel and has a longer vertex.
Occurs on a range of trees, especially, elm, sycamore maples, horse chesnut but not oak, as in A. albostriella. Found in southern Britain
Adult: July to September
Length 3.5-4.5 mm
|Adult: south London (August 2007) ©Joe Botting
|Adult: Dorset (August 2009) ©Mark Dunkling
||Adult: north London (July 2008) ©Tristan Bantock
|Adult (dark form): Surrey (July 2009) ©Tristan Bantock