Monopsia mammosa from Oamaru, New Zealand. Some debris on the slide. Single example on the slide, facing upwards (oculus towards the coverslip). Dated 1916. Prepared by Thomas W Robertson. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 85 images stacked in Zerene (Pmax).
Original publication and holotype designation: Grove, E. & Sturt, G. (1887). On a fossil marine diatomaceous deposit from Oamaru, Otago, New Zealand. Appendix. Journal of the Quekett Microscopical Club, Series 2 3(19): 131-148, pls 10-14.