The spirotrichs are a large and distinctive group of ciliate protozoa. They typically have prominent oral cilia in the form of a series of polykinetids, called the adoral zone of membranelles, beginning anterior to the oral cavity and running down to the left side of the mouth. There may also be one or two paroral membranes on its right side. The ...
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http://en.wikipedia.org/wiki/Spirotrich
(class Spirotrichea), any of a group of ciliated protozoans characterized by nonuniform, sparse ciliation and prominent membranelles of fused cilia ...
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http://www.britannica.com/eb/a-z/s/142
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