Excystment of the metacercaria of the trematode Clinostomum marginatum
Abstract
The metacercaria of Clinostomum marginatum, a trematode parasite of heron and other fish eating birds excystedin chicken and toad bile and human urine. Excystment occurs at 32°C in Chicken bile, 31°C in toad bile and at 33°C and 35°C in human urine. Temperature less than 30°C do not cause excystment in all the media. Excystment in C. marginatum involves activation of the metacercaria by the media and its emergence through a hole created at one end of its spherical or ovoid wall. The rest of the cyst wall remainsintact after the emergence of the metacercaria.
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