Two examples of Aulacodiscus allorgei from Kamischev, Russia. Fossil marine material. Mounted in Styrax and dated May [19]36. Mountant has yellowed. Prepared by JA Long. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo NA 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 68 images stacked in Zerene (Pmax).
Aulacodiscus allorgei Chenevière, 1934. Original description: Chenevière, E. (1934). Sur un dépôt fossile marin à diatomées situé à Kamischev (Russie centrale). Bulletin de la Société Française de Microscopie, 3(3): 103-107, pls 5-8. Page 106, Plate 8, Figure 2.