Triceratium new species, from Singiliewsky, Russia. Rare. I think this could be Triceratium speciosum. Single example on the slide, shown as two image stacks, one focusing on the upper part of the diatom, the other the lower part. Prepared by Samuel Meakin. Mounted in Styrax, dated September 1943. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective. Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Stacks prepared using Zerene (Pmax).