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We elucidate the morphology of the miracidia with passive strategy of infection. In contrast to the well‐studied “active” free‐swimming larvae (e.g., those of Schistosoma, Fasciola, Echinostoma), “passive” miracidia do not search for their hosts in the external environment. The infection occurs only after the mollusk ingests the eggs with the larvae. The miracidia of this type are extremely miniaturized...