OBSERVATIONS ON THE ULTRASTRUCTURE OF THE LATE SPOROBLAST AND THE INITIATION OF SPOROZOITE FORMATION IN EIMERIA BRUNETTI

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Abstract
The ultrastructure of the late sporoblast and the initiation of sporozoite formation in E. brunetti [from chicken feces] was examined in oocysts allowed to sporulate for 24 h at 27.degree. C. The late sporoblast was ellipsoidal in shape and possessed 2 nuclei with associated Golgi bodies, situated at either end of the organism. Its cytoplasm contained numerous polysaccharide granules, electron translucent vacuoles, dense bodies, mitochondria and some strands of rough endoplasmic reticulum. The sporoblast, at this stage, was enclosed by 2 unit membranes. Sporozoite formation was initiated by the appearance of a dense plaque at either end of the organism in the vicinity of a nucleus, adjacent to the limiting membrane of the sporoblast. A conoid was present in the central region of the plaques. Sporozoite formation was similar to the initiation of merozoite formation in the schizont. Endodyogeny did not appear to be involved in sporozoite formation.

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