An optical cross-section. The edge at the end of the shell neck shows a temporary closure, possibly the beginning of an encystment. Scale bar indicates 25 µm. Sample from a bog near Reith/Pillersee (Tyrol, Austria). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA).
