Aulacodiscus decorus from Newport, California, USA. Seven processes. Single example on the slide. Mounted in Styrax. Prepared by RI Firth. 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. 68 images stacked in Zerene (Pmax). Done as a reverse stacking from the bottom to the top to try and better retain the detail in processes.
Aulacodiscus elegans Grove & Sturt, 1887. Published in: 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. Page 140, Plate XII, Figure 30.