An arrangement of Heliopelta leeuwenhoekii from Maryland, USA. Current name for this is Actinoptychus heliopelta. One of the diatoms has gone walkabout. Prepared by WA Firth. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective. Olympus Aplanat Achromat condenser, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 15 images stacked in Zerene (Pmax).