Biology / Bio 2253 · Atom · ~20 seconds
Phylum Rotifera
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Rotifers are microscopic, pseudocoelomate animals named for a ciliated feeding structure around the mouth that appears to rotate as its cilia beat, sweeping food toward it.
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A rotifer's beating ciliary crown draws algae and bacteria toward its mouth, resembling a spinning wheel.
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Rotifers are pseudocoelomate, unlike most Lophotrochozoa phyla, which are coelomate; the clade is defined by molecular evidence, not body-cavity type.