Stictodiscus parallelus from Oamaru, New Zealand. Mounted in Styrax. Prepared by Watson and Sons Ltd. 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 the camera to increase the field of view. Monochrome converted Nikon d850 camera. 73 images Pmax.
Stictodiscus parallelus f. parallelus (Ehrenberg) Grove & Sturt, 1887. Reference: Grove, E. & Sturt, G. (1887). On a fossil marine diatomaceous deposit from Oamaru, Otago, New Zealand. Appendix. Journal of the Quekett Microscopical Club, Series 2, 3(19): 131-148, pls 10-14. Page 138. Also see Triceratium parallelum f. trigona A.W.F.Schmidt 1882. Published in: Schmidt, A.[W.F.] (1882). Atlas der Diatomaceen-kunde Series II : Heft 19. pp. pls 73-76. Aschersleben: Ernst Schlegel’s Verlag. Plate 75, Figures 11-13. And Desikachary, T.V. & Sreelatha, P.M. (1989). Oamaru diatoms. Bibliotheca Diatomologica 19: [1]-330, including 145 plates. Page 239, Plate 100, Figure 15.