Blepharisma tenue
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Kahl attributes the ciliate’s rosy colour to an accumulation of purple bacteria. Recent work confirms that the cause is a purple bacterial endosymbiont: https://www.science.org/doi/10.1126/sciadv.abg4102
Collected in Mer Bleue, mid may, 2013.
body length 150 um
Olympus BHB 40X obj. (400X)