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Vorticella, 400X w.m.
Vorticella is a genus of protozoa, with over 16 known species. They are stalked, inverted bell-shaped ciliates, placed among the peritrichs. Each cell has a separate stalk anchored onto the substrate, which contains a contractile fibril called a myoneme. When stimulated, this shortens, causing the stalk to coil like a winter. Vorticella species mainly live in freshwater ponds and streams?generally anywhere protists are plentiful.