Slide labelled ‘Rattrayella 6 ocelli, Melosira‘, no location given. The Rattrayella only has 5 ocelli, and I think is R. simbirskiana. The ‘Melosira’ are I think Paralia sulcata var. biseriata f. coronata. Unknown maker. Olympus BHB microscope using 450nm LED light. For the image of the Rattrayella, 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. 46 images stacked in Zerene (Pmax). Some debris above and below the diatom which shows up as shadows in the image.
See Patricia A. Sims (2006) A REVISION OF THE GENUS RATTRAYELLA DE-TONI INCLUDING A DISCUSSION ON RELATED GENERA, Diatom Research, 21:1, 125-158, DOI: 10.1080/0269249X.2006.9705656 for more information on R. simbirskiana.
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.