Two examples of Truania archangelskiana from Singiliewsky, USSR. The smaller one in the upper right has its rim upwards to the coverslip (underside view). Mounted in Naphrax and dated 18/4/[19]72. Prepared by Richard Gosden. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 58 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.