An arrangement of six Actinoptychus heliopelta. Prepared by Watson and Sons Ltd. Olympus BHB microscope using 450nm LED light. As well as the arrangement I imaged the one on the right with 8 sectors using the 40x Leitz Pl Apo NA 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 91 images Pmax. Underside view with the rim upwards towards the coverslip.
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.