This specimens were gathered in the Kieler Förde (Baltic Sea). For identification look at https://ncma.bigelow.org/ccmp2084?___SID=U#.XBDyleJCfRY.
The sample contained several single-cell-specimen except this one. indicates 25 µm.
The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Axioplan with MFT camera Olympus OM-D E-M5 II.
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Wolfgang Bettighofer, www.protisten.de.