Aulacodiscus asiaticus from Sendai (written Sandai on the slide), Japan. Single, partial example, which has moved outside the red ring. Would be 12 processes if intact. 424µm diameter. Prepared by Laurence Miles. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective.Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 52 images stacked in Zerene (Pmax).
Aulacodiscus asiaticus Brun 1892. Published in: Schmidt, A.[W.F.] (1892). Atlas der Diatomaceen-kunde. Series IV: Heft 43/44. pp. pls 169-176. Leipzig: O.R. Reisland. Plate 169, Figure 2.