A pair of Aulacodiscus orientalis from the Sandwich Islands (the South Sandwich Islands are a group of eleven remote, volcanic islands in the southern Atlantic Ocean that form part of the British Overseas Territory of South Georgia and the South Sandwich Islands). Mounted in Styrax and dated May 1939. Prepared by Samuel Henry Meakin. Olympus BHB microscope using 450nm LED light. As well as the arrangement I imaged the right hand one using the 63x Leitz Pl Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting, parallel and perpendicular to the long axis. 2.5x Nikon CF PL photoeyepiece. 11mm removed from the tube to the camera to increase the field of view. Monochrome converted Nikon d850 camera. 51 images stacked in Zerene (Pmax). 16 processes.
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.