Tripos horridus =Ceratium horridum.
Sample from North Sea near Heligoland (spring diatom ). 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.