Pinnularia divergens and 2x Coscinodiscus sp. from Warri, South Nigeria. No makers name, but I think this is by JA Long. Olympus BHB microscope using 450nm LED light. The Pinnularia was also imaged using a 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. 13 images stacked in Zerene (Pmax).
Pinnularia divergens W.Smith 1853. Published in: Smith, W. (1853). A synopsis of the British Diatomaceae; with remarks on their structure, function and distribution; and instructions for collecting and preserving specimens. The plates by Tuffen West. In two volumes. Vol. I. pp. [i]-xxxiii, 1-89, pls I-XXXI. London: John van Voorst, Paternoster Row. Page 57, Plate XVIII [18], Figure 177.