Fine Structure of Sporozoites of Eimeria nieschulzi*

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Abstract
SYNOPSIS. An electron microscope study of sporozoites of Eimeria nieschulzi Dieben, 1924 revealed that they have a pellicle which is thickened at the anterior end to form 2 polar rings. Radiating posteriorly from the rings, directly beneath the pellicle, are approximately 25 microtubules which may aid in support and locomotion of the sporozoite. Within the polar ring is a dense conoid. Numerous toxonemes extend posteriorly from the area of the conoid. Two paranuclear bodies are present and some toxonemes are closely associated with the anterior body. Numerous ribosomes, bodies containing granular material, and osmiophilic vesicle bounded bodies are also present. Each sporozoite has a single nucleus with a diffuse karyosome and distinct nuclear double membrane.

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