Entogonia sp.. No location given. Unknown maker. 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. 78 images stacked in Zerene (Pmax).
There is a good review of this genus in: Holmes, R.W. & Brigger, A.L. (1979). The marine fossil diatom genus Entogonia Greville – A review. Bacillaria 2: 155-214. Looking through this, I’ve settled on three potential possibilities (although I am certainly open to other names, please let me know if you know what it is);
Plate 7, Fig 55. Entogonia formosa.
Plate 8, Fig 67. Entogonia hungarica.
Plate 12, Fig 104. Entogonia reinholdii.
I recently acquired about 60 slides by this maker, so if you want to see others by them, search for AAAAA in the Search option at the top of the page, and I’ll include this in each of the pages for them.