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Vorticella convallaria
''Vorticella convallaria'' is a protozoan, the type species of the genus ''Vorticella''. It resembles ''V. campanula'', but differs in being somewhat narrow in the anterior end and usually having no refractile granules in the endoplasm.
''Vorticella convallaria'' exhibits two morphological types. The primary type is the sessile trophont stalked zooid. When environmental conditions deteriorate the stalked zooid excises its stalk and transforms into ''Vorticella's'' secondary type, the motile dispersive telotroch. When the telotroch finds suitable environs it reattaches to the substrate and transforms back into a stalked zooid.
The cell body of this species is 50-95 μm long and 35-53 μm wide. The peristome ranges from 55-75 μm in diameter. The rod-like, contractile stalk is 25-300 μm long and 4 μm wide. It can collapse into a tightly coiled helix in less than 1/60th of a second.〔Bras, R., A. Upadhyaya, A. van Oudenaarden & C. Ortiz 2002. (Imaging of the World's Fastest Biological Spring ''Vorticella convallaria'' Via Atomic Force Micoscopy ). American Physical Society, Annual APS March Meeting, March 18-22, 2002 Indiana Convention Center, Indianapolis, Indiana. Meeting ID: MAR02, abstract #M33.107〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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