Triceratium schmidtii (8 angles), from Ambrim Island, New Hebrides (Ambrym, Vanuatu). Single example on the slide mounted with the rim upwards towards the coverslip. Prepared by William Allott Firth. Olympus BHB microscope using 450nm light. 40x Leitz Pl Apo NA 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Image stacks prepared in Zerene (Pmax). Three stacks are shown – a full stack of the all images, a partial stack of about 2/3 of the images showing the middle and lower parts of the diatom, and stack of about 1/3 of the images which emphasizes the processes and some different features in the cells. Quite an amazing structure.
Triceratium schmidtii var. schmidtii Janisch in Schmidt et al., 1885. Original description: Schmidt, A. (1885). Atlas der Diatomaceen-kunde. Aschersleben, Commissions-Verlag Von Ludwig Siever’s Buchandlung, Series III(Heft 21-22): pls. 81-88. Plate 86, Figures 1,2. This name is currently regarded as a synonym of Biddulphia schmidtii (Janisch) A.Mann 1925. Published in: Mann, A. (1925). Marine diatoms of the Philippine Islands. Bulletin United States National Museum 100(6, part 1): 1-182, 39 pls. Page 46.