Two examples of Coscinodiscus radiatus var. irregularis from Conset, Barbados. Prepared by JA Long. Olympus BHB microscope using 450nm LED light. I imaged the larger of the two at higher resolution using a 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. 29 images stacked in Zerene (Pmax).
Coscinodiscus radiatus var. irregularis Grunow in Van Heurck, 1883. Original description: Van Heurck, H. (1880). Synopsis des Diatomées de Belgique. Atlas. Ducaju & Cie., Anvers. Plate 129, Figure 1.