A slide of Auliscus hardmanianus from Oamaru, New Zealand. Single example on the slide. Viewed from the underside. Prepared by ECP Bone. Mounted in Hyrax and dated April 1963. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 34 images stacked in Zerene (Pmax).
The lower label says; “True A. hard with flat processes as shown by Greville.”. This refers to: Greville, R.K. (1866). Descriptions of new and rare Diatoms. Series XVIII. Transactions of the Microscopical Society, New Series, London 14: 1-9, pls I, II. In the 1866 article A. hardmanianus is shown with flat ocelli. However some examples of A. hardmanianus, including one I have on this site show them as angled (here). I also have another example where they are flat (here). Also included here the text from Greville’s paper, and the figure (rotated 90 degrees).