Pinnularia sp. from Arroyo Hondo, Maria Madre Island, Mexico. Single example on the slide. Fossil marine material from the Miocene. Mounted in Naphrax and dated September 1969. Inverted – underside view, rim upwards towards the coverslip. 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. 18 images stacked in Zerene (Pmax).
Not sure on a species for this one, so far I haven’t found anything I’d consider a good match. Any ideas, please let me know.