Biddulphia oamaruensis. Single example on the slide. Rim facing the coverslip. No location or makers name. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 71 images stacked in Zerene (Pmax). Original description: Grove, E. & Sturt, G. (1886). On a fossil marine diatomaceous deposit from Oamaru, Otago, New Zealand. Part I. Journal of the Quekett Microscopical Club, Series 2, 2(16): 321-330, pls 18-19. p. 325; pl. 18, fig. 10.
Synonymised name: Odontella oamaruensis (Grove & Sturt) De Toni, 1894.
I recently acquired about 60 slides by this maker, 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.