Two examples of Podosira argus from New Hebrides (Vanuatu, Pacific Ocean). The upper right one has the rim down away from the coverslip. The lower left one is rim up, and tilted slightly. Recent marine material. Mounted in Hyrax. Prepared by Flatters and Garnett Ltd. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 70 images stacked in Zerene (Pmax). Couldn’t get close enough to use the 63x Leitz objective.
Podosira argus Grunow, 1878. Published in: Grunow, A. (1878). Algen und Diatomaceen aus dem Kaspischen Meere. In: Naturwissenschaftliche Beiträge zur Kenntnis der Kaukasusländer, auf Grund seiner Sammelbeute. (Schneider, O. Eds), pp. 98-132. Dresden: Dresden Burdach. Page 132.