The hypotrichs are a group of ciliate protozoa, included among the spirotrichs. Most are oval in shape, with a rigid pellicle, and have cirri (bundles of cilia) distributed in isolated tufts on the ventral surface of the cell. Some also have dorsal cilia, which function as sensory bristles. Euplotes and Aspidisca are common genera. Like other cili...
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http://en.wikipedia.org/wiki/Hypotrich
any dorsoventrally flattened, oval protozoan of the ciliate order Hypotrichida, very widely distributed in both fresh and salt water. Instead of ...
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http://www.britannica.com/eb/a-z/h/92
any ciliate of the suborder Hypotricha, having cilia chiefly on the ventral surface.
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https://www.infoplease.com/dictionary/hypotrich
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