Two examples of Coscinodiscus apiculatus from Richmond (presumably the Miocene deposit at Richmond, Virginia). The upper right one is an underside view with the rim towards the coverslip. Mounted in Hyrax. High contrast slide. Prepared by Flatters and Garnett Ltd. 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. 11mm removed from the tube the camera to increase the field of view. Monochrome converted Nikon d850 camera. 47 images stacked in Zerene (Pmax).
Coscinodiscus apiculatus Ehrenberg 1844. Published in: Ehrenberg, C.G. (1844). Mittheilung über 2 neue Lager von Gebirgsmassen aus Infusorien als Meeres-Absatz in Nord-Amerika und eine Vergleichung derselben mit den organischen Kreide-Gebilden in Europa und Afrik. Bericht über die zur Bekanntmachung Geeigneten Verhandlungen der Königl. Preuss. Akademie Der Wissenschaften zu Berlin 1844: 57-97. Page 77.
Also see Andrews, George W. “Miocene Diatoms from Richmond, Virginia.” Journal of Paleontology, vol. 60, no. 2, 1986, pp. 497–538. JSTOR, http://www.jstor.org/stable/1305174. Accessed 27 July 2026. Page 512. Figure 4.15. I’ve included a screenshot of the entry for this above.