Triceratium sp. (I think this is Triceratium dobreeanum var. novazealandica) from Oamaru, New Zealand. Single example on the slide. Mounted in Styrax. Prepared by Samuel Henry Meakin. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo 0.65 objective. Olympus Aplanat Achromat condenser, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 62 images stacked in Zerene (Pmax). Towards the upper end of the size for this – approx. 305µm per side (as measured in ImageJ).
Triceratium dobreeanum var. novazealandica Grove & Sturt 1886. Published in: 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)(16): 321-330, pls 18, 19. Page 328, Plate 19, Figures 17,18. This name is currently regarded as a synonym of Entogoniopsis novazealandica (Grove & Sturt) J.Witkowski, P.A.Sims, N.I.Strelnikova & D.M.Williams. Published in: Witkowski, J., Sims, P.A., Strelnikova, N.I. & Williams, D.M. (2015). 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: 1-89, 253 figures, 1 table.