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Syngamy and Sporogony of Hepatozoon griseisciuri Clark, 1958 (Sporozoa: Haemogregarinidae), in Its Natural Vector, Haemogamasus reidi Ewing, 1925 (Acari:Mesostigmata)

Bryce C. Redington and Leo A. Jachowski, Jr.
The Journal of Parasitology
Vol. 57, No. 5 (Oct., 1971), pp. 953-960
DOI: 10.2307/3277842
Stable URL: http://www.jstor.org/stable/3277842
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Syngamy and Sporogony of Hepatozoon griseisciuri Clark, 1958 (Sporozoa: Haemogregarinidae), in Its Natural Vector, Haemogamasus reidi Ewing, 1925 (Acari:Mesostigmata)
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Abstract

The entire sporogonic development of the gray squirrel hemogregarine, Hepatozoon griseisciuri, in its natural vector mite, Haemogamasus reidi, is described. Gametes appear to fuse completely in the mite with no production of microgametes prior to zygote formation. Zygotes and young sporonts are observed by 72 and 120 hr postexposure, respectively. Marked growth of oocysts occurs between days 8 and 20, the rate slowed significantly in heavy infections. Oocyst differentiation is dominant after 20 days with sporoblasts and mature oocysts seen as early as 22 and 28 days, respectively. Some oocysts require up to 43 days to mature in heavy infections. Mature sporocysts each regularly contain 4 sporozoites with no residual body. Sporozoites excysted in 5% squirrel bile exhibit considerable motility.

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