Three slides of Malaya shell cleanings prepared by ECP Bone. Recent marine material. Mounted in Naphrax and dated January 1972. Prepared by ECP Bone. 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. Images stacked in Zerene (Pmax).
The first one (above) is labeled as Navicula but with no species. Looking for matches, I came across the the Genus Petroneis, and I think this looks like it belong there. It looks a bit like Petroneis granulata, but that is just speculation at the moment.
The next is labelled Coscinodiscus again with no species. Looking closely though I think it might be a Thalassiosira sp. MaybeThalassiosira symmetrica (USGS Atlas Plate 4, Figure 103, Azores, as it’s a reasonable match). However will leave it with a question mark for now.
Final one is also labelled as Coscinodiscus. This one does look like it is a Coscinodiscus sp.