In connection with the Norwegian "Day of Geology" our national postal service requested the Geological museum (University of Oslo) for specimens that could make a good impression on stamps. Photographs from many fossil groups and minerals were provided. And guess? They picked a radiolarian on one stamp and another one as a logo on the first day cover envelope (see .pdf file). You probably all know these species. Not very common in the Norwegian Sea, though, but on print they are ok.