Triceratium majus (slide says new sp. or abnormal ? – I think it is abnormal rather than a new species). Single example on the slide. Underside view with the rim towards the coverslip Issues with the mountant/adhesive to the coverslip. No location or mountant given. Unknown maker. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo 0.65 objective. Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 36 images stacked in Zerene (Pmax).
Triceratium majus (Grove & Sturt) Grove & Sturt 1888. Published in: 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. Page 40.
Currently accepted name Entogoniopsis major as discussed in Jakub Witkowski, Patricia A. Sims, Nina I. Strelnikova & David M. Williams, “Entogoniopsis gen. nov. and Trilamina gen. nov. (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser”, (Phytotaxa 209), 89 pp, available here.
I recently acquired about 30 more slides by this maker to add to the ones I already had, so if you want to see others by them, search for AAAAA in the Search option at the top of the page, and I’ll include this in each of the pages for them.