Cionus tuberculosus, is a species of weevil native to Europe.

[1] Observations on the platform INaturalist spread as far north as Stockholm, Denmark, and Liverpool.

The western edge lies in Cornwall and Brittany.

[2] The habitat is tied to the presence of figworts, which are ponds, streams or hedge banks.

The prefix "dark" distinguishes it from the "Weißschildiger Braunwurzschaber" (white-shielded figworts scraper), the Cionus scrophulariae (figwort weevil).