Lepidodiscus elegans from Singiliewsky, USSR. Single example on the slide. Some debris overlaying it. Fossil marine material. Mounted in Naphrax and dated 14/10/[19]70. Prepared by Richard Gosden. 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. 55 images stacked in Zerene (Pmax).
Lepidodiscus elegans Witt 1886. Published in: Witt, O.N. (1886 ‘1885’). Ueber den Polierschiefer von Archangelsk-Kurojedowo im Gouv. Simbirsk. Verhandlungen der Russisch-kaiserlichen Mineralogischen Gesellschaft zu St. Petersburg, Series II 22: 137-177, pls. VI-XII. Page 163, Plate 7, Figure 6.
Also see: Witkowski, J., Harwood, D.M. (2010). Observations on two species of Lepidodiscus Witt (Bacillariophyta) from Devon Island, Canadian High Arctic. Micropaleontology 56: 587-597.