An arrangement of Triceratium robustum from Maryland, USA. Fossil material. Prepared by Arthur Charles Cole. Some issues with the mountant, so I chose to remove the one on the right. I also tidied up what looks to be a bit of debris on the top one. 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. 45 images stacked in Zerene (Pmax).
Triceratium robustum Greville 1861. Published in: Greville, R.K. (1861). Descriptions of new and rare Diatoms. Series II. Transactions of the Microscopical Society, New Series, London 9: 67-73, pl. VIII. Page 71, Plate VIII, Figure 15.