This pictures is a synopsis of apertural () and abapertural views and shows the circular (pseudostom) and the elliptical cross-section of the test´s bulb. A defecation is visible in the center. indicates 50 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.