Specimen from the Algal Culture Collection at the University of Cologne (CCAC), strain number M3342. Link: http://www.ccac.uni-koeln.de/. Sample material courtesy of AG Boenigk, University Duisburg-Essen. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with DSLR Canon 600 D.

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