Triceratium polycistinorum from Kamischev, Russia. Current name Entogoniopsis polycistinora. Single example on the slide. Described as ‘Rare’. Prepared by Sidney Chaffers. The ring around the coverslip has bled into the mount, although the diatom is still clearly visible. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo NA 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 43 images stacked in Zerene (Pmax).