Strew slide from Thurø, Denmark. Prepared by Brian Darnton. Range of species present. Olympus BHB microscope using 450nm LED light. I selected one, a Pleurosigma sp. (maybe Pleurosigma strigosum var. finmarchicum, although it is a little on the small size for this), for further imaging. 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. 68 images stacked in Zerene (Pmax).
If it is indeed P. strigosum var. finmarchicum, it is also known as Pleurosigma finmarchicum.