A new species of pleasing fungus beetles Triplax contienensis sp. nov. is described from Bitterfeld amber. The new fossil species differs from extant congeners in the subparallel pronotum, the rounded scutellum and the absence of the median stria on the metasternum. The new taxon confirms the morphological stability through time within the genus and suggests that Triplax was present in the European fauna since at least the Eocene.