Entogonia marginata from Springfield, Barbados. Single example on the slide, mounted at an approximately 45 degree angle. Prepared by WA 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. 91 images stacked in Zerene (Pmax).
Original name: Triceratium marginatum Brightwell, 1856. Original description (of Triceratium marginatum Brightwell, 1856), Brightwell, T. (1856). Further observations on the genus Triceratium, with descriptions and figures of new species. Quarterly Journal of Microscopical Science, London, 4: 272-276, pl. XVII. Page 295, Plate 17 (XVII), Figure 13.
Also see: Holmes, R.W. & Brigger, A.L. (1979). The marine fossil diatom genus Entogonia Greville – A review. Bacillaria 2: 155-214.