An arrangement of three examples of Muelleriella limbata in between two Triceratium diatoms and two disc diatoms. Different orientations. No makers name. Olympus BHB microscope using 450nm LED light. As well as an image with a 10x Nikon Plan Apo NA 0.45 objective, and with the 20x Nikon Plan Apo NA 0.65 objective, I imaged the three using the 63x Leitz Pl Apo NA 1.40 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 60 images stacked in Zerene (Pmax).
Muelleriella limbata (Ehrenberg) Van Heurck, 1896. Published in: Van Heurck, H. (1896). A treatise on the Diatomaceae. Translated by W.E. Baxter. pp. 1-558, pls 1-35. London: William Wesley & Son. This name is currently regarded as a synonym of Muelleriopsis limbata (Ehrenberg) Hendey, 1972. Published in: Hendey, N.I. (1972). Muelleriella limbata (Ehrenberg) Van Heurck in Eocene South Atlantic cores. In: Simonsen, R. (Ed.), Proceedings of the First Symposium on Recent and Fossil Marine Diatoms, Bremenhaven, September 21-26, 1970. Beihefte zur Nova Hedwigia 39: 79-94. Page 87, Plates 1,2. Basionym: Pyxidicula limbata Ehrenberg.
Also see (for good SEM images): Seiichi Komura (2004), An SEM observation on the sporic diatom Muelleriopsis limbata (Ehrenb. ) Hendey. Diatom 20: 179-190.
I good slide of very unusual diatoms. I have recently imaged a few slides by this maker, all of which are nice. If you want to see others search for CCCCC in the ‘Search’ function.