Two examples of Truania archangelskiana from Singilevo, Russia. Mounted in Hyrax and dated August 1966. Prepared by ECP Bone. 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. 34 images stacked in Zerene (Pmax).
Truania archangelskiana Pantocsek 1886. Published in: Pantocsek, J. (1886). Beiträge zur Kenntnis der Fossilen Bacillarien Ungarns. I. Theil Marine Bacillarien. pp. 1-74, 30 pls. Nagy-Tapolcsány: Buchdrucherei von Julius Platzko. Page 45, Plate 20, Figure 178.
Also see: Sims, P. A., & Crawford, R. M. (2007). The fossil diatom genus Truania Pantocsek and its relationship with Ellerbeckia Crawford. Diatom Research, 22(1), 197–207. https://doi.org/10.1080/0269249X.2007.9705704
I was a bit lucky with this one (which I’m glad as this is one of my ‘wish list’ diatoms). It has quite a small coverslip ring and I just managed to be able to use the 63x objective.