Actinocyclus ellipticus from South Naparima, Trinidad. Single example on the slide. Fossil marine material. Mounted in Naphrax and dated February 1967. Prepared by ECP Bone. Olympus BHB microscope using 450nm LED light.63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 22 image stacked in Zerene (Pmax).
Actinocyclus ellipticus Grunow in Van Heurck 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 124, Figure 10.