Slide with a diatom described as Triceratium parallelum var., from Chalky Mt, Barbados. Single example on the slide. Prepared by William Allott Firth. 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. 33 images stacked in Zerene (Pmax).
I think this is one of those diatoms which was originally put into the ‘Triceratium‘ genus but is something else. Maybe a Stictodiscus parallelus variant of some type?