An arrangement of Biddulphia rhombus from Dunkirk, Maryland, USA. Mounted in Hyrax. Prepared by JA Long. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. 11mm of the tube to the camera removed to increase the field of view. Monochrome converted Nikon d850 camera. 84 images stacked in Zerene (Pmax).
Biddulphia rhombus (Ehrenberg) W.Smith 1854. Published in: Roper, F.C.S. (1856). Some observations on the Diatomaceae of the Thames. Transactions of the Microscopical Society of London, New Series 2: 67-80, pl. VI. Page 76, Plate 6, Figure 5. This name is currently regarded as a synonym of Zygoceros rhombus Ehrenberg. Source of synonymy: Lavigne, A.S., Sunesen, I. & Sar, E.A. (2015). Morphological, taxonomic and nomenclatural analysis of species of Odontella, Trieres and Zygoceros (Triceratiaceae, Bacillariophyta) from Anegada Bay (Province of Buenos Aires, Argentina). Diatom Research 30(4): 307-331.