I was trying out some plastic Petri dish covers as wave plates on a slide with many vorticella. Most of them were sessile with just the odd one free swimming around the slide. As water evaporated from the slide a scan of the slide revealed that most had dropped their stalk and stopped cilia rotation. Was this a result of preparation for a dry spell?
In addition while scanning I found an interesting Arcella, one with pseudopodia that I had never encountered before.
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