Ruthenoceras

{{short description|Genus of fossil molluscs}}

{{Automatic taxobox

| taxon = Ruthenoceras

}}

Ruthenoceras is a conical Cambrian fossil originally classified as a cephalopod, but which is too poorly preserved for a classification to be upheld.{{The Mollusca|volume=12|chapter=Main features of cephalopod evolution|author=Clarke, M.R.|author2=Trueman, E.R.}}