Triceratium hardmannianum (splet Hardmanianum on the slide) from Springfield, Barbados. Single example on the slide. Metal spacers for the coverslip. Prepared by WA Firth. 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. Monochrome converted Nikon d850 camera. 57 images stacked in Zerene (Pmax).
Triceratium hardmanianum Greville 1865 (as ‘Hardmanianum‘). Published in: Greville, R.K. (1865). Descriptions of new and rare diatoms. Series XVI . Transactions of the Microscopical Society, New Series, London 13: 43-57 [last page as “75”], 2 pls [pls V, VI]. Page 55, Plate VI [6], Figure 25. This name is currently regarded as a synonym of Crawfordia hardmaniana (Greville) P.A.Sims, J.Witkowski & E.A.César. Source of Synonymy: Sims, P.A., Witkowski, J. & César, E.A. (2021). Crawfordia gen. nov.: solving the riddle of Triceratium hardmannianum Grev. (Bacillariophyta). Nova Hedwigia, Beiheft 115: 205-221, 7 pls, 2 tables.
I have some other examples of this rare and unusual looking diatom on the site, so check in the Search function at the top of the page for those if you’re interested.