Abstract

Excystment of the metacercaria of the trematode Mesocoelium monodi. International Journal for Parasitology 16: 237–239. The metacercaria of Mesocoelium monodi, an intestinal trematode parasite of Agama agama and Bufo regularis, excysted in 0.025% chymotrypsin, chicken and toad bile, human urine at 36°C, duodenal and intestinal extracts of toad, lizard and rat without pretreatment with any enzyme or reagent. 0.025% amylase, pepsin and trypsin did not induce hatching. Excystment in M. monodi is regarded as an active process in which the excystment media are considered to stimulate the metacercaria to increase its muscular activity and produce secretions which dissolve an escape aperture in the cyst wall. The rest of the cyst wall remains intact after the metacercaria has escaped.

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