Schistosoma life cycle lack redia stage

In the snail intermediate host miracidium develop into sporocyst, daughter sporocyst and finally cercaria

Schistosomes have indirect digenetic life-cycles, involving sexual reproduction in vertebrate definitive hosts and asexual reproduction in snail intermediate hosts. Parasites are transmitted between hosts by motile aquatic stages which actively seek hosts. Blood flukes form five different developmental stages: eggs, miracidia, sporocysts, cercariae, and adult worms. Miracidia are elliptical free-swimming larval stages covered with cilia. Sporocysts appear as pleomorphic sac-like bodies which contain developing cercariae.

http://parasite.org.au/para-site/text/schistosoma-text.html

According to the following RG link, which was conducted as a comparative analysis of reproductive generations in two evolutionary species of Digenea, the study found that during the life cycles of the two studied species, most genes change their expression levels significantly. The study also indicates an unexpectedly high level of plasticity in the regulation of genes between closely related species. , which may provide a high-quality reference source for future evolutionary studies and comparative analyses.

Article Molecular signatures of the rediae, cercariae and adult stag...

The aquatic life cycle of schistosoma lack redia stage

Dear Morka Amante,

In Schistosoma spp. life cycle, asexual reproduction occurs in the suitable invertebrate host (snail), where the miracidia penetrate the snail tissue and form sporocysts by two successive generation and emerge forked-tail cercariae. The latter released by snail into water and free swimming until find the vertebrate host (human) and complete its life cycle.

Kind regards

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