A slide with no name (but it has been identified, more in a minute on that) from South Atlantic Eocene Core. Single, partial example on the slide. Mounted in Naphrax and dated November 1974. 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. 75 images stacked in Zerene (Pmax).
Back to the name. Thank you to Jakub Witkowski for identifying it (one I had never heard of). Ailuretta rotunda Sims, 1986. Original description: Sims, P.A. (1986). Sphynctolethus Hanna, Ailuretta gen. nov., and evolutionary trends within the Hemiauloideae. Diatom Research, 1(2): 241-269. Page 256, Figures 42-48, 72-73. In this paper the type locality it given as: South-western Atlantic, 51”08’S, 54”22’W, 1525 m. depth, “Vema” Cruise 17, Core 107, 50 cm. Therefore this might even help with narrowing down on where this came from.