Abstract
Rediae ofParorchis acanthus were examined by scanning electron microscopy and the ultrastructure of the surface related to migration through the digestive gland ofNucella lapillus. The median ventral birth papilla, ventro-lateral processes, and posterior papilliform process, of young active rediae, apparently serve to anchor the body during migration. The honeycomb-like apex of the birth papilla and ventro-lateral processes may be a strengthening device. Uniciliate sensory receptors around the mouth, on the birth papilla, and posterior terminal papilla are probably touch receptors or chemoreceptors concerned with feeding and orientation during migration. After the formation of the birth pore, and with increase in size and in the number of contained cercariae, the redia becomes less active, loses its characteristic shape, and is eventually immobile.
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References
Bils, C.F., Martin, W.E.: Fine structure and development of the trematode integument. Trans. Am. Microsc. Soc.85, 78–88 (1966)
Brown, F.J.: Some fresh-water larval trematodes from Cheshire. Parasitology23, 88–89 (1931)
Irwin, S.W.B., Threadgold, L.T., Howard, N.M.:Cryptocotyle lingua (Creplin) (Digenea: Heterophyidae): observations on the morphology of the redia, with special reference to the birth papilla and release of cercariae. Parasitology76, 193–199 (1978)
Komiya, Y.:Clonorchis and clonorchiasis. Adv. Parasitol.4, 53–106 (1966)
Krupa, P.L., Bal, A.K., Cousineau, G.H.: Ultrastructure of the redia ofCryptocotyle lingua. J. Parasitol.53, 725–734 (1967)
Krupa, P.L., Cousinea, G.H., Bal, A.K.: Ultrastructural and histochemical observations on the body wall ofCryptocotyle lingua rediae (Trematoda). J. Parasitol.54, 900–908 (1968)
Køie, M.: On the histochemistry and ultrastructure of the redia ofNeophasis lageniformis (Lebour, 1910) (Trematoda: Acanthocolpidae). Ophelia9, 113–143 (1971a)
Køie, M.: On the histochemistry and ultrastructure of the daughter sporocyst ofCercaria buccini Lebour, 1911. Ophelia9, 145–163 (1971b)
Martin, W.E.: The life histories of Hawaiian heterophyid trematodes. J. Parasitol.44, 305–323 (1958)
Moore, M.N., Halton, D.W.: A histochemical study of the redia and cercaria ofFasciola hepatica. Z. Parasitenkd.47, 45–54 (1975)
Prévot, G.: Contribution à l'étude des cercaires de prosobranches de la région marseillaise:Cercaria mirabilicaudata n.sp. (Trematoda, Digenea, Opisthorchioidea) deCerithium vulgatum Brug. Bull. Soc. Zool. Fr.92, 515–523 (1967)
Rees, G.: Light and electron microscope studies of the redia ofParorchis acanthus Nicoll. Parasitology56, 589–602 (1966)
Rees, G.: The ultrastructure of the epidermis of the redia and cercaria ofParorchis acanthus Nicoll. A study by scanning and transmission electron microscopy. Parasitology62, 479–488 (1971)
Ssinitzin, D.: Über einige neue und wenig bekannte Organe der digenetischen Trematoda. Zool. Anz.27, 766–770 (1904)
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Rees, F.G. Surface ultrastructure of the redia ofParorchis acanthus Nicoll (Digenea: Philophthalmidae). Z. Parasitenkd. 63, 33–46 (1980). https://doi.org/10.1007/BF00927724
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DOI: https://doi.org/10.1007/BF00927724