ELECTRON-MICROSCOPIC STUDIES ON DEVELOPMENT OF KINETES OF THEILERIA-PARVA-THEILER, 1904 IN GUT OF VECTOR TICKS RHIPICEPHALUS-APPENDICULATUS-NEUMANN, 1901

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  • 1 January 1978
    • journal article
    • research article
    • Vol. 35  (2) , 123-136
Abstract
The development of motile stages, called kinetes, from a stationary stage (regarded as a zygote) was followed in T. parva using EM. This process started after the molt of tick nymphs which had sucked on highly infected calves, i.e., about 20 days after repletion (a.r.) of the ticks. The transformation took place by formation of a growing protrusion (anlage) into an inner, enlarging vacuole. During this process the limiting membrane of the enlarging vacuole served as the outer membrane of the developing motile stage, whereas the 2 inner ones as well as the subpellicular microtubules were newly formed. This transformation proceeded rapidly, so that on the 25th day a.r. most of the kinetes had already left the gut cells and started penetration into the salivary gland cells. On the way to the salivary glands nuclear divisions occurred within the kinetes. The steps of the transformation described were compared to those in T. annulata and to ookinete formation in Haemosporidia.

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