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Cyclidium citrullus Cohn, a Ciliate from the Hot Springs of Tiberias (Israel)
DAVID KAHAN,
DAVID KAHAN
Department of Zoology, the Hebrew University of Jerusalem, Jerusalem, Israel
Search for more papers by this authorDAVID KAHAN,
DAVID KAHAN
Department of Zoology, the Hebrew University of Jerusalem, Jerusalem, Israel
Search for more papers by this authorSYNOPSIS
A thermophilic ciliate Cyclidium citrullus (Hymenostomatida) was collected from Tiberias hot springs at temperatures of 50–58 C. In the laboratory, the ciliates were grown in monoxenic cultures with Escherichia coli in a mineral medium of 3% (w/v) salts similar in composition to that of the hot springs. C. citrullus tolerates a wide range of temperatures, 18–47 C. The optimal temperature is ∼44 C. The ciliates could tolerate direct transfer to salt concentrations of 0.2–7.0% (hot springs composition). No cysts or other dormant forms have been observed. A description of the ciliate based on living and stained specimens is given. The taxonomy and ecology of Cyclidium from hot springs is discussed.
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