Aulacodiscus tumulifer from Sendai (written as Sandai on the label), Japan. Single example on the slide. 12 processes. Prepared by Laurence Miles. Olympus BHB microscope using 450nm LED light. 40x Nikon Plan Apo NA 0.65 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 94 images stacked in Zerene (Pmax).
Aulacodiscus tumulifer Brun 1891. Published in: Schmidt, A. et al. (1874-1959). Atlas der Diatomaceen-kunde. Leipzig: Aschersleben. Plate 162, Figure 3. Nomen. Homotypic synonym: Tripodiscus tumulifer (Brun) Kuntze 1898.