Aulacodiscus excavatus from Kamischev, U.S.S.R. Single example on the slide. Fossil marine material. Sty.Ar (Styrax Aroclor) mountant. Dated January 1969. 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, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 51 images stacked in Zerene (Pmax).
Aulacodiscus excavatus A.W.F.Schmidt 1876. Published in: Schmidt, A.[W.F.] (1876). Atlas der Diatomaceen-kunde. Series I: Heft 9. pp. pls. 33-36. Aschersleben: Verlag von Ernst Schlegel. Plate 36, Figure 10.