Two example of Aulacodiscus orientalis from Paama Is, New Hebrides (Paama is a small island in Malampa Province, Vanuatu). 9 and 12 processes. Prepared by William Allott Firth. Olympus BHB microscope using 450nm LED light. As well as the pair I imaged the larger one with a 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. 74 images stacked in Zerene (Pmax).
Aulacodiscus orientalis Greville 1864. Published in: Greville, R.K. (1864). Descriptions of new and rare Diatoms. Series XI. Transactions of the Microscopical Society, New Series, London 12: 8-14, pls I, II. Page 12, Plate 2, Figure 6.