An arrangement of three Aulacodiscus oregonus from Monterey, California, USA. Prepared by William Allott Firth. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo NA 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 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. 43 images stacked in Zerene (Pmax).
Aulacodiscus oregonus Harvey & Bailey, 1853. Published in: Harvey, W.H. & Bailey, J.W. (1853). New species of Diatomaceæ, collected by the United States Exploring Expedition, under the command of Capt. Wilkes, U.S.N. Proceedings of the Academy of Natural Sciences of Philadelphia 6(11): 430-431. Page 430 (as ‘Oreganus‘).