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Spirostomum is a very large ciliate measuring from 300-600 microns long (almost big enough to see with the naked eye).  It has a long opaque, cylindrical body. 

The ectoplasm in the Spirostomum has strong myonemes which contract the body to one fourth its length in 6-8 miliseconds.   Because of these contractions, a thick culture looks like a plate of wiggling spaghetti.

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