Form of the Extrusomes and Secreted Material of the Ciliated Protozoon Pseudourostyla cristata, with Some Phylogenetic Interpretations: A Light, Scanning Electron, and Transmission Electron Microscopic Study

The hypotrichous ciliated protozoon Pseudourostyla cristata possesses a high density of extrusive organelles. These have been examined by light, scanning electron, and transmission electron microscopy. They are secreted onto the surface of the cell when exposed to any of several LM and EM fixatives....

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Bibliographic Details
Published in:Transactions of the American Microscopical Society 1985-10, Vol.104 (4), p.350-359
Main Authors: Grim, J. Norman, Manganaro, Carol A.
Format: Article
Language:English
Subjects:
Agriculture
Biochemistry. Physiology. Immunology. Molecular biology
Biological and medical sciences
Cilia
Coatings
Cysts
Cytoplasm
Electrons
Freshwater
Fundamental and applied biological sciences. Psychology
Materials
Organelles
Protozoa
Secretion
Trophozoites
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Summary:The hypotrichous ciliated protozoon Pseudourostyla cristata possesses a high density of extrusive organelles. These have been examined by light, scanning electron, and transmission electron microscopy. They are secreted onto the surface of the cell when exposed to any of several LM and EM fixatives. After secretion, their form varies considerably and depends upon the fixative used. The normal form probably is a complexly folded mucoid covering that is secreted, we believe, during encystment. The cyst wall material covers intact cilia which remain on the surface of the pellicular membranes. The cytoplasmic, non-secreted extrusive organelle is unlike that of other hypotrichs. Their distribution within the cytoplasm and the retention of cilia after secretion may have ramifications for the phylogeny of the family to which it belongs.
ISSN:0003-0023
2325-5145
DOI:10.2307/3226488