Aulacodiscus janischii from Oamaru, New Zealand. Single example on the slide. Another name crossed out (maybe ‘stoschii‘). No makers name, but prepared by Laurence Hardman. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 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. 97 images stacked in Zerene (Pmax).
Aulacodiscus janischii 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 139, Plate 11, Figure 28.
Aulacodiscus stoschii Janisch 1876. Published in: Schmidt, A. et al. (1874-1959). Atlas der Diatomaceen-kunde. . Leipzig: Aschersleben. Plate 34, Figure 11; nomen. This name is currently regarded as a synonym of Aulacodiscus decorus var. stoschii (Janisch) Rattray. 1888. Published in: Rattray, J. (1888). A revision of the genus Aulacodiscus Ehrb. Journal of the Royal Microscopical Society 8(3): 337-382, 3 pls [V-VII]. Page 345.