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Peritrich
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==Order Sessilida== The larger order of Peritrichia are the [[Sessilida]]. Most of these have modified posterior [[kinetosome]]s which secrete a contractile stalk. The unattached stage, called a [[telotroch]], is mouthless. These are common in both freshwater and marine environments, and many live attached to aquatic plants and animals. They are either solitary or produce branched colonies. A few secrete a [[Lorica (biology)|lorica]]. ''[[Vorticella]]'' is one of the best-known genera. Stalks may be as long as 2 mm, and in some cases where they are highly contractile can be extended up to 3 mm. [[Image:Zoothamnium niveum.jpg|thumb|center|upright=1.3|''[[Zoothamnium niveum]]'']]
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