Abstract
Regional and age differences in the epidermis of the redia ofP. acanthus have been studied by transmission electron microscopy. The depth of the outer cytoplasmic epidermis increases by four times from stage I to stage III and the microvilli double their length and branch by stage II. Electron-dense and electron-lucent membrane bound bodies are present in all stages, the latter being released onto the surface as vesicles. Multivesicular bodies appear in stage III. All are formed in one type of secretory epidermal cell body. Anterior and posterior concentric folds, of thickened outer cytoplasmic epidermis only, increase the surface area and also the diameter of the redia on contraction. In stages I and II the apical regions of the ventro-lateral processes and birth papilla, and the lattice pattern on the posterior papilla, each consisting of thickened outer cytoplasmic epidermis only, may provide rigidity and support during migration. The uniciliate sensory receptors appear to be mechanoreceptors.
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Gwendolen Rees, F. The ultrastructure of the epidermis of the redia ofParorchis acanthus nicoll (Digenea; Philophthalmidae). Z. Parasitenkd. 65, 19–30 (1981). https://doi.org/10.1007/BF00926550
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DOI: https://doi.org/10.1007/BF00926550