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Electron microscopy of Eimeria acervulina macrogametogony and oocyst wall formation

Published online by Cambridge University Press:  06 April 2009

R. M. Pittilo  and
S. J. Ball
R. M. Pittilo
Affiliation:
Department of Histopathology, Bland-Sutton Institute of Pathology, Middlesex Hospital Medical School, London W1P 7PN
S. J. Ball
Affiliation:
Department of Biology, North East London Polytechnic, Romford Road, London E15 4LZ
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Summary

Macrogametogony and the formation of the oocyst wall has been examined in Eimeria acervulina. Macrogametes develop within a parasitophorous vacuole. Within the cytoplasm can be observed wall-forming bodies of Type I (WFBI). and Type II (WFBII), a nucleus, mitochondria, canaliculi and polysaccharide granules. WFBII are unusual in possessing a membrane internal to the granular endoplasmic reticulum. Formation of the outer layer of the oocyst wall is preceded by the separation of a veil membrane, and accompanied by morphological changes in the WFBI. WFBI material is deposited between the veil-forming membrane and the two cytoplasmic membranes. A newly formed membrane divides this outer layer during its early development. The inner layer of the oocyst wall is formed from WFBII material which is deposited between the cytoplasmic limiting membranes. The outer layer of the oocyst wall consists of granular and osmiophilic parts, but the inner layer of the wall is homogenous.

Type
Research Article
Information
Parasitology , Volume 89 , Issue 1 , August 1984 , pp. 1 - 8
Copyright
Copyright © Cambridge University Press 1984

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