The live between the filaments of the red alga Audouinella. First step of the defecation . The defecation opens. The indicates 25 µm.
Sample from an aquarium for tropical fishes. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with Canon 600D CCD camera.
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Wolfgang Bettighofer, www.protisten.de.