Slide labelled as Triceratium sp. from Newcastle, Barbados. Single example on the slide. Dated March 1881. Prepared by William Allott Firth. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 68 images stacked in Zerene (Pmax).
Interesting one this. Firth called it a ‘Triceratium‘ but given the structure of the diatom at the three corners it doesn’t look like a Triceratium to me. As to what it is, I am not sure. If you know please drop me an email and I can update the page.