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Cercaria of Trichobilharzia sp. obtained from the Chilina dombeyana snail. (a) General view (optical microscopy), (b) head (SEM), (c) head organ (SEM), (d) bifurcated tail (SEM). Ac, Acetabulum; Nv, natatory velum; Oc, ocelli; Os, oral sucker; Pe, penetration grand; Sp, spines.
