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Development of Theileria parva (Theiler, 1904) in the gut of Rhipicephalus appendiculatus (Neumann, 1901)

Published online by Cambridge University Press:  06 April 2009

E. Schein ,
M. Warnecke  and
P. Kirmse
E. Schein
Affiliation:
Institut für Parasitologie und Tropenveterinärmedizin der Freien Universität Berlin, Königsweg 65, D 1000 Berlin 37.
M. Warnecke
Affiliation:
Institut für Parasitologie und Tropenveterinärmedizin der Freien Universität Berlin, Königsweg 65, D 1000 Berlin 37.
P. Kirmse
Affiliation:
Institut für Parasitologie und Tropenveterinärmedizin der Freien Universität Berlin, Königsweg 65, D 1000 Berlin 37.
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Summary

The life-cycle of Theileria parva in the gut of the tick Rhipicephalus appendiculatus was investigated in Giemsa-stained smears and in wet preparations under the phase-contrast microscope. The different developmental stages of T. parva were seen in a large proportion of specially-selected R. appendiculatus tickes. After the intra-erythorcytic merozoites were engorged by the ticks during a blood meal, the following development was observed. (1) In the lumen of the gut of infected nymphs, spindle-shaped microgamonts developed out of the ring-forms. These broke up into several thread-like microgameters after nuclear division and development of thread-like cytoplasmic projections. The ring-froms developed into round-forms of 3–4 μm in diameter which are considered to be macrogametes. (2) From the 6th day after repletion, zygotes with a clear zone in the centre appeared in the epithelial cells of the tick's gut. A steady increase in size and a progressively denser cytoplasm were observed up to the 3rd day after moulting to adult ticks. (3) Subsequently a slightly angular, retort-like stage developed by invagination inside the rounded zygotes, and from the 5th day after moulting this stage developed further into a club-shaped kinete. The kinetes propelled themselves in the gut by active gliding movements.

Type
Research Article
Information
Parasitology , Volume 75 , Issue 3 , December 1977 , pp. 309 - 316
Copyright
Copyright © Cambridge University Press 1977

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