Brightwellia pulchra from Conset, Barbados. Single example on the slide. Mounted in Naphrax with I/61, which I presume is January 1961, aftwards. Prepared by Richard Gosden. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 55 images stacked in Zerene (Pmax).
Original description: Van Heurck, H. (1880). Synopsis des Diatomées de Belgique. Atlas. Ducaju & Cie., Anvers. Plate 128, fig. 9. I’ve seen this described as being the same as Brightwellia coronata in some references.