Appearance
The genus Stereonychus of which S. fraxini is the only representative in central and northwestern Europe is set off from the rest of the otherwise similar Cionini by having single tarsal claws on all legs. The beetles are quite variable in their colours, ranging from almost entirely pale to almost entirely black.
Distribution
Stereonychus fraxini has a wide distribution over most of Europe and parts of North-Africa
Food
The larvae and beetles feed monophagous on Fraxinus excelsior in central and northern Europe, but also using Fraxinus ornus in southern parts of it's range.References:
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