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The wingspan is 16–19 mm (0.63–0.75 in). The forewings are dark black variously mixed with brown and with a darker band along the distal edge of the pale antemedian line. The pale postmedian line is usually distinct against the dark ground colour. A similar species is Eudonia lacustrata, which differs from Eudonia mercurella by the broken wavy line that forms a broad white spot at the tip of the wing (apex). Another distinguishing feature of the females is the ventrodistal hump of the valvae. Furthermore, Eudonia mercurella resembles Eudonia speideli externally and pale specimens of Eudonia liebmani.[2][3][4]
Behavior
The moth flies from June to August depending on the location.[citation needed][5]
Figs. 6, 6a, 6b, 6c, 6dlarvae in various stages of growth 6e enlarged figure of two segments of 6
Mark Parsons, Sean Clancy, David Wilson A Guide to the Pyralid and Crambid Moths of Britain and Ireland: Atropos, England. ISBN:9780955108648
References
^Li, W.-c., 2012: One new species of the genus Eudonia Billberg (Lepidoptera: Crambidae: Scopariinae) from China. Entomotaxonomia34 (2): 267–269.
^Barry Goater, Matthias Nuss, Wolfgang Speidel: Pyraloidea I (Crambidae, Acentropinae, Evergestinae, Heliothelinae, Schoenobiinae, Scopariinae). In: P. Huemer, O. Karsholt, L. Lyneborg (Hrsg.): Microlepidoptera of Europe. 1. Auflage. Band 4. Apollo Books, Stenstrup 2005, ISBN87-88757-33-1, S. 150
^Goater, B., Dyke . G. and Tweedie, R. 1986 British Pyralid Moths: A Guide to Their IdentificationISBN9780946589081
