Original caption: The sessile rotifer Floscularia (Melicerta) ringens, draws in food with water currents created by rapidly beating cilia. It builds its tube from compacted pellets rolled from debris in a special socket at the rear of the head. The synchronous movement of the cilia has been frozen in this picture with high speed electronic flash. When observed, the motion is so rapid and perfectly synchronized, the two lobes with cilia almost appear as small spinning wheels. Early microscopists sometimes used the term "wheeled animalcules" to describe such rotifers.
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