An arrangement of Gephyria media from the Sandwich Islands. Couple of possible locations for this – the South Sandwich Islands (a sub-Antarctic archipelago near Antarctica) or the Hawaiian Islands (originally named the Sandwich Islands by Captain Cook in 1778). Mountant has yellowed. Prepared by Watson and Sons Ltd. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo 0.65 objective. Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 43 images stacked in Zerene (Pmax).
Gephyria media Walker-Arnott 1860. Published in: Walker-Arnott, Dr [G.A.] [Arnott, G.A.W.] (1860). Notes on Figs 13 and 14 [Appended to ‘Description of Diatomaceae, chiefly of those found in “Elide” (Lower California) guano’]. Quarterly Journal of Microscopical Science, London 8: 18-21. Page 20.