Biddulphia fossa from Oamaru, New Zealand. Single example on the slide. Looks to have broken during mounting. Prepared by Frederick Marshall. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 24 images stacked in Zerene (Pmax).
Biddulphia fossa Grove & Sturt 1887. Published in: 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 133, Plate 10, Figure 15. This name is currently regarded as a synonym of Anaulus fossus (Grove & Sturt) Grunow. Source of synonymy: Grunow, A. (1888). Referate. Grove, E. and Sturt, G. On a fossil marine diatomaceous deposit from Oamaru, Otago, New Zealand (Journal of the Quekett Microscopical Club. Ser. II Vol. III. No. 18 and No. 19.1887. Part III and appendix.). Botanisches Centralblatt 34(2/3): 34-41.