Pyrgodiscus armatus from Brno, Tegl, Czech Republic. Single example on the slide. Marine fossil. Mounted in Darax and dated 15-05-(20)25. Prepared by Michel Haak. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 145 images stacked in Zerene (Pmax). This was one of my largest image stacks.
Pyrgodiscus armatus Kitton ex Cleve 1885. Published in: Cleve, P.T. (1885). On some fossil marine diatoms found in the Moravian “Tegel” from Augarten, near Brünn. Journal of the Quekett Microscopical Club, series 2 2: 165-177, pls XII, XIII. Page 173, Plate XIII (13), Figures 13a, 13b.
Full disclosure. I did some tidying up of this image. There was some dirt on the left side of the diatom, and I cloned this out with some of the background. I have not added anything to the body of the diatom, and I have not replaced missing parts. I believe this one warranted it as it could be removed without needing to replace any part of the diatom, and due to the utmost rarity of this one. I think this might just be my new favourite…..