Triceratium venosum from Springfield, Barbados. Single example on the slide. Very rare. Prepared by Thomas Edward Doeg. 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. 39 images stacked in Zerene (Pmax).
Accepted name Entogoniopsis venosa (Brightwell) J.Witkowski, P.A.Sims, N.I.Strelnikova & D.M.Williams, 2015. Discussed 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. Also, a similar looking asymmetric example is seen in; Witkowski, J; Harwood, D; Wade, B; Bryłka, K; (2020) Rethinking the chronology of early Paleogene sediments in the western North Atlantic using diatom biostratigraphy. Marine Geology, 424, Article 106168. 10.1016/j.margeo.2020.106168.