Not sure on this one. I originally thought it might be a Rhaphoneis of some type, but having thought on it I think it is a Synedra sp., although a very short one. May come back and change this again. From a strew slide from Cormacks, Oamaru, New Zealand. Prepared by Little Imp. Mounted in Naphrax and dated March 2019. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 11 images stacked in Zerene (Pmax).