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Title: Trichocyst  
Author: World Heritage Encyclopedia
Language: English
Subject: Warnowiaceae, Extrusome, Protista, Lamina (algae), Axostyle
Collection: Cell Biology, Protista
Publisher: World Heritage Encyclopedia


A trichocyst is an ciliates[1][2] and dinoflagellates.[3]

A trichocyst can be found in tetrahymena and along cila pathways of several metabolic systems.

It is also a structure in the cortex of certain ciliate and flagellate protozoans consisting of a cavity and long, thin threads that can be ejected in response to certain stimuli. Trichocysts may be widely distributed over an organism or restricted to certain areas (e.g., tentacles, papillae, around the mouth). There are several types. Mucoid trichocysts are elongated inclusions that may be ejected as visible bodies after artificial stimulation. Filamentous trichocysts in Paramecium and other ciliates are discharged as filaments composed of a cross-striated shaft and a tip. Toxicysts (in Dileptus and certain other carnivorous protozoans) tend to be localized around the mouth. When discharged, a toxicyst expels a long, nonstriated filament with a rodlike tip, which paralyzes or kills other microorganisms; this filament is used to capture food and, presumably, in defense.

The functional significance of other trichocysts is uncertain, although those of Paramecium apparently can be extruded for anchorage during feeding.


  1. ^ Madeddu, L.; Gautier, M. C.; Vayssié, L.; Houari, A.; Sperling, L. (1995). "A large multigene family codes for the polypeptides of the crystalline trichocyst matrix in Paramecium". Molecular Biology of the Cell 6 (6): 649–659.  
  2. ^ Pease, D. C. (1947). "The structure of trichocysts revealed by the electron microscope". Journal of cellular physiology 29 (1): 91–94.  
  3. ^ Miller, J. J.; Delwiche, C. F.; Coats, D. W. (2011). "Ultrastructure of Amoebophrya sp. And its Changes during the Course of Infection". Protist 163: 720–745.  

External links

  • Picture of a Trichocyst
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