An arrangement of five Heliopelta metii. No location or makers name. Olympus BHB microscope using 450nm LED light. As well as the arrangement I imaged one using the 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. 65 images stacked in Zerene (Pmax). Underside view, rim upwards towards the coverslip. Nice clean mountant.
Heliopelta metii Ehrenberg, 1844 (1845). Original description: 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 268. This name is currently regarded as a synonym of Actinoptychus heliopelta Grunow 1883. Published in: Van Heurck, H. (1882). Synopsis des Diatomées de Belgique. Atlas. pp. pls LXXVIII-CXXXII [78-132 and supplementary pls 22 bis, 82bis, 83bis, 83ter, 95bis], tables genres. Anvers: Ducaju et Cie. Plate 123, Figure 3.