Heibergia barbadensis from Barbados. Single example on the slide. Mounted in Styrax. Prepared by John Andrew Shulze, Philadelphia (see here for more details). 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. 61 images stacked in Zerene (Pmax).
Original description: Greville, R.K. (1865). Descriptions of new and rare diatoms. Series XVII. Transactions of the Microscopical Society, New Series, London 13: 97-105, 2 pls [VIII, IX]. Page 100, pl. VIII [8]: figs 8, 9. This name is currently regarded as a synonym of Entogonia barbadensis (Greville) Holmes & Brigger. See review: Holmes, R.W. & Brigger, A.L. (1979). The marine fossil diatom genus Entogonia Greville – A review. Bacillaria 2: 155-214. Figs. 11-13.