A strew from Jewell, Maryland. Fossil marine material. Diatomite sample from H Jay Margolis. Diatom sample from the collection of Colonel William D Fleming, US Army, MD FRMS. Mounted in Pleurax and dated 30/5/2026. Prepared by Michel Haak. Olympus BHB microscope using 450nm LED light. As well as the wider view I imaged one using the 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. 47 images stacked in Zerene (Pmax).
Actinocyclus octonarius var. ralfsii (W.Smith) Hendey 1954. Published in: Hendey, N.I. (1954). A preliminary check-list of British marine diatoms. Journal of the Marine Biological Association of the United Kingdom 33: 537-560. Page 557.