An arrangement of four Surirella gemma from Havre. Mounted in Hyrax. Prepared by JA Long. Olympus BHB microscope using 450nm LED light. I selected one for imaging at higher resolution using a 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 46 images stacked in Zerene (Pmax).
Surirella gemma (Ehrenberg) Kützing 1844. Published in: Kützing, F.T. (1844). Die Kieselschaligen Bacillarien oder Diatomeen. pp. [i-vii], [1]-152, pls 1-30. Nordhausen: zu finden bei W. Köhne. Page 62. This name is currently regarded as a synonym of Petrodictyon gemma (Ehrenberg) D.G.Mann. Source of synonymy: Round, F.E., Crawford, R.M. & Mann, D.G. (1990). The diatoms. Biology and morphology of the genera. pp. [i-ix], 1-747. Cambridge: Cambridge University Press.