Nitzschia species with large cells. The inserts show keel arcs of the fibulate raphe system and the nucleus with nucleolus and the chromatine structure typical for diatom nuclei. Scale bar indicates 100µm. multi layer image using 12 frames generating depth of focus, stacked manually using Corel Photopaint.

 Sample from a pond on the island of Hiddensee (Baltic Sea, Germany). This image was taken using Zeiss Universal with Olympus C7070 CCD camera.