Tripos muelleri = Ceratium tripos
The specimen was gathered in the Kieler Förde (Baltic Sea). indicates 50 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.