Stained with Calcofluor White, an optical brightener which stains the cellulose plates of armoured dinoflagellates.
Here's the corresponding brightfield image:
Admittedliy, it doesn't look very nice, apologies for that. Lugol preservation generally does not give great views, and this is heavily bleached with thiosulphate before staining.
The dinoflagellate comes from a brackish creek in the south of the Netherlands. It is called Alexandrium ostenfeldii, one of the toxic species involved in shellfish intoxication. Cells are about 35 um across.
Images: 20x/0.7 Olympus splanapo, cmos cam TIS 5Mp. Stacks of around 15 images.
Best wishes, René
