Kessleria alternans is a moth of the family Yponomeutidae. It is found in France, Switzerland and Italy.Fauna Europaea It has also been recorded from the Caucasus.
The length of the forewings is 8–9.2 mm for males and 6.7-8.1 mm for females. Adults have been recorded from mid to the end of July.Huemer, P. & G. Tarmann (1991): Westpaläarktische Gespinstmotten der Gattung Kessleria NOWICKI: Taxonomie, Ökologie, Verbreitung. — Mitteilungen der Münchner Entomologischen Gesellschaft 81: 5-110
The larvae feed on Saxifraga oppositifolia and Saxifraga paniculata.
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