Arachnoidiscus antarcticus from Commonwealth Bay, Adélie Sand (presumably Land). Single example on the slide. Mounted in Styrax. No makers name but prepared by JA Long. 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. 19 images stacked in Zerene (Pmax). Underside view with the rim to the coverslip.
Arachnoidiscus antarcticus N.E.Brown 1920. Published in: Brown, N.E. (1920). New and old diatoms from the Antarctic Regions. II. English Mechanic and World of Science 111(2880): 219–220, 7 figures. Page 219. Type locality: Antarctica: Commonwealth Bay, Adelie Land (INA 1996). Type: BM 62191 (Williams 2023: 187). Williams, D.A. (2023). Notes on the diatom collections of the Natural History Museum, London (BM) VIII: the types of Arachnoidiscus in Brown’s monograph (Brown 1933). Diatom Research 3(4): 181-208, 80 figures, two tables.