This testate constructs a proteinaceous shell with numerous tiny alveoli reinforcing the test. Oblique view, focus on test surface. This picture was built up using numerous frames with manual stacking technique using Corel Photopaint. The indicates 25 µm.
Sample from a freshwater pond on the island of Hiddensee (Baltic Sea, Germany). This image was taken using Zeiss Universal with Olympus C7070 CCD camera.
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Wolfgang Bettighofer, www.protisten.de.