Monopsia mammosa from Oamaru, New Zealand. Slide by JA Long and mounted in Styrax. Single example on the slide mounted between 3 other diatoms (presumably to help with locating the main subject). Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.40 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 21 images stacked in Zerene (Pmax).