Development of Carmyerius exoporus Maplestone (Trematoda: Gastrothylacidae) in a snail host

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Dinnik N.N
Dinnik J.A
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The development of Carmyerius exoporus Maplestone in the snail Anisus natalensis Krauss is described with the emphasis laid on the redial and cercarial productivity of the rediae of the first and subsequent generations. The miracidium gives rise to one sporocyst. From 25 to 32 germinal cells present in the miracidium, only six to eleven develop into embryo balls in the sporocyst and, of these, only three to nine develop into rediae of the first generation. The rediae of the first generation gives birth to daughter rediae and cercariae. No alternation in the development of redial and cercarial embryos was noted in the rediae of C. exoporus and a small number of redial embryos was observed to develop alongside the more numerous cercarial embryos throughout the life of the first generation rediae. The rediae of the second and subsequent generations also give birth to daughter rediae and cercariae. The cercariae leave their parent rediae when they are still immature and continue the development in the snail tissue.
East African Agricultural And Forestry Journal, 50, p. 469-480