Campylodiscus samoensis from Cannes, in between two disc diatoms. Single example on the slide. No makers name, but based on style I think this is by JA Long. Olympus BHB microscope using 450nm LED light. As well as the arrangement, I imaged the main diatom using a 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. 104 images stacked in Zerene (Pmax). Couldn’t get close enough with the 63x Leitz Pl Apo objective.
Campylodiscus samoensis Grunow 1875. Published in: Schmidt, A.[W.F.] (1875). Atlas der Diatomaceen-kunde. Series I. Heft 4. pp. pls 13-16. Aschersleben: Verlag von Ernst Schlegel. Plate 15, Figures 19,20. This name is currently regarded as a synonym of Coronia samoensis (Grunow) Ruck & Guiry. Source of synonymy: Ruck, E. & Guiry, M.D. (2016). Validation of the diatom genus name Coronia (Surirellaceae, Bacillariophyta). Notulae Algarum 11: 1-3.