An arrangement of three Sceptroneis caduceus from Sharktooth Hill, California, USA. Mounted in Styrax and dated September 1943. Prepared by Samuel Henry Meakin. Olympus BHB microscope using 450nm LED light. As well as the arrangement I did a higher resolution image using the 63x Leitz Pl Apo NA 1.40 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Images stacked in Zerene (Pmax).
Sceptroneis caduceus Ehrenberg 1844. Published in: Ehrenberg, C.G. (1844). Untersuchungen über die kleinsten lebensformen im quellenlande des Euphrats und Araxes, so wie über eine an neuen formen sehr reiche marine tripelbildung von den Bermuda-Inseln. Bericht über die zur Bekanntmachung geeigneten Verhandlungen der Königlich-Preussischen Akademie der Wissenschaften zu Berlin 1844: 253-275, 1 pl. Page 271. This name is currently regarded as a synonym of Rhaphoneis caduceus (Ehrenberg) Heurck 1885. Published in: Van Heurck, H. (1885). Synopsis des Diatomées de Belgique. Texte. pp. [1]-235. Anvers: Martin Brouwers & Co. Page 147.