Two examples of Stictodiscus parallelus var. quadrigona from St Laurent, France. Fossil marine material. Sty.Aro. (Styrax Aroclor) mountant, and dated November 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, oblique lighting. 2.5x Nikon CF PL photoeyepiece. 11mm of extension to the camera removed. Monochrome converted Nikon d850 camera. 35 images stacked in Zerene (Pmax).
Stictodiscus parallelus f. quadrigona Pantocsek, 1886. Original description: Pantocsek, J. (1886). Beiträge zur Kenntnis der Fossilen Bacillarien Ungarns. Teil I, Marine Bacillarien. Nagy-Tapolcsány, Buchdrucherei von Julius Platzko, 74 pp., 30 pls. Page 68, Plate 6, Figure 51.