Two examples of Coscinodiscus lineatus from the Phillipine Islands. The larger one is ‘rim down’ and the smaller one ‘rim upwards towards the coverslip’. Prepared by WA Firth. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 27 images stacked in Zerene (Pmax).
Coscinodiscus lineatus Ehrenberg 1839. Published in: Ehrenberg, C.G. (1839). Über die Bildung der Kreidefelsen und des Kreidemergels durch unsichtbare Organismen. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin 1838: 59-147, pls I-IV, tables 1, 2. Page 129. This name is currently regarded as a synonym of Thalassiosira leptopus (Grunow) Hasle & G.Fryxell.