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Per A. Sundberg, PhD
Phylum Rotifera Number of families 34
Group of microscopic animals characterized by the presence of a complex jaw apparatus and a ciliary wheel organ used for locomotion and feeding
Photo: Light micrograph of a common pond dwelling rotifer Philodina sp. seen feeding among organic matter and filamentous algae. The head of this rotifer is funnel-shaped, terminating in a mouth that is fringed with cilia or fine hairs. These hairs beat rapidly against the water, creating currents that draw particles in food into the mouth. (Photo by ©John Walsh/Science Photo Library/Photo Researchers, Inc. Reproduced by permission.)
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