The fine structure of the body wall of Gyrocotyle urna (original) (raw)
Summary
The covering layer of Gyrocotyle, which is thought to occupy an intermediate position between the monogeneans and the cestodes, resembles that of the cestodes more than the epidermis of the ectoparasitic monogeneans. It is a cytoplasmic epidermis bearing densely arranged microvilli and is connected to parenchymally situated cell bodies. The microvilli of Gyrocotyle differ from the microtriches of tapeworms in lacking a thickened tip. Vesicles between the microvilli at the free edge of the epidermis are associated with disintegrating striated rod-bodies and are therefore probably secretory rather than concerned with micropinocytosis. The epidermal cell bodies have the characteristics of secretory cells and appear to elaborate the striated rod-bodies which occur throughout the outer epidermis and may consist of condensed mucoprotein. Cells with electron opaque cytoplasm which occur in the neighbourhood of the epidermal cell bodies have been identified as myoblasts. The posterior rosette appears to be specialized for adhesion as gland cells secreting PAS positive material line the ventral rosette surface and the epidermis of this region bears short bifurcate microvilli.
Zusammenfassung
Die Deckschicht von Gyrocotyle, die offenbar eine Zwischen-stellung zwischen der von Monogenen, Trematoden und Cestoden einnimmt, ist der von Cestoden mehr als der Epidermis ektoparasitischer Monogenea ähnlich. Sie stellt eine zytoplasmatische Epidermis dar, die aus dicht stehenden Mikrovilli besteht, und ist verbunden mit einem parenchymatösen Zellkörper. Die Mikrovilli von Gyrocotyle unterscheidet sich von den Mikrotrichen der Bandwürmer darin, daß ihnen eine verdickte Spitze fehlt. Bläschen zwischen der Mikrovilli am freien Rand der Epidermis hängt mit zerfallenden gestreiften stäbchenförmigen Körpern zusammen und sind eher sekretorischer Natur als Ausdruck einer Mikropinozytose. Die epidermalen Zellkörper haben die charakteristischen Eigenschaften von sekretorischen Zellen und scheinen die gestreiften länglichen Körper auszuscheiden, die über die ganze Epidermis verteilt vorkommen und aus einem kondensierten Mukoprotein bestehen. Zellen mit elektronendichtem Zytoplasma, die in der Nachbarschaft der epidermalen Zellkörper auftreten, sind als Myoblasten identifiziert worden. Die hintere Rosette erscheint spezialisiert zum Anheften wie Drüsenzellen; sie sezernieren PAS-positives Material entlang der ventralen Rosetten-Oberfläche. Die Epidermis dieser Region trägt kurze zweigallige Mikrovilli.
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References
- Béguin, F.: Étude au microscope électronique de la cuticule et de ses structures associeés chez quelques cestodes. Éssai d'histologie comparée. Z. Zellforsch. 72, 30–46 (1966).
Google Scholar - Bråten, T.: An electron microscope study of the tegument and associated structures of the proceroid of Diphyllobothrium latum. Z. Parasitenk. 30, 9–103 (1968a).
Google Scholar - — The fine structure of the tegument of Diphyllobothrium latum (L). A comparison of the plerocercoid and adult stages. Z. Parasitenk. 30, 104–112 (1968b).
Google Scholar - Bychowsky, B. E.: Monogenetic trematodes - their systematics and phylogeny, ed. W. J. Hargis Jr. Washington, D. C.: American institute of biological sciences 1957.
Google Scholar - Charles, G. H., Orr, T. S. C.: Comparative fine structure of outer tegument of Ligula intestinalis and Schistocephalus solidus. Exp. Parasit. 22, 137–149 (1968).
Google Scholar - Erasmus, D. A.: The host-parasite interface of Cyathocotyle bushiensis Khan, 1962 (Trematoda, Strigeoidea). II. Electron microscope studies of the tegument. J. Parasit. 53, 703–714 (1967).
Google Scholar - Halvorsen, O., Williams, H. H.: Studies on the helminth fauna of Norway. IX. Gyrocotyle (Platyhelminthes) in Chimaera monstrosa from Oslo fjord, with emphasis on its mode of attachment and regulation in the degree of infection. Nytt Mag. Zool. 15, 130–142 (1968).
Google Scholar - Ito, S.: The enteric surface coat on cat intestinal microvilli. J. Cell Biol. 27, 475–491 (1965).
Google Scholar - Lee, D. L.: The structure and composition of the helminth cuticle. In: Advances in parasitology, vol. IV (B. Dawes, ed.). New York: Academic Press 1966.
Google Scholar - Llewellyn, J.: The evolution of parasitic platyhelminths. In: Third symposium of the British Society for Parasitology. Oxford: Blackwell 1965.
Google Scholar - Lumsden, R. D.: Cytological studies on the absorptive surfaces of cestodes. I. The fine structure of the strobilar integument. Z. Parasitenk. 27, 355–382 (1966).
CAS PubMed Google Scholar - — Cytological studies on the absorptive surfaces of cestodes. III Hydrolysis of phosphate esters. J. Parasit. 54, 524–535 (1968).
Google Scholar - — Byram III, J.: The ultrastructure of cestode muscle. J. Parasit. 53, 326–342 (1967).
Google Scholar - Lyons, K. M.: A comparison of the adult epidermis of some monegeneans: the development of the outer layer in Entobdella soleae. Parasitology 58 (Suppl.), 14 P (1968).
- -- The fine structure of the adult epidermis of two skin parasitic monogeneans, Entobdella soleae and Acanthocotyle elegans. In preparation.
- Morseth, D. J.: Fine structure of the hydatid cyst and protoscolex of Echinococcus granulosus. J. Parasit. 53, 312–325 (1967a).
Google Scholar - — Observations on the fine structure of the nervous system of Echinococcus granulosus. J. Parasit. 53, 492–500 (1967b).
Google Scholar - Pearse, A. G. E.: Histochemistry theoretical and applied, 2nd ed. London: J. & A. Churchill Ltd. 1961.
Google Scholar - Rothman, A. H.: Colloid transport in the cestode Hymenolepis diminuta. Exp. Parasit. 21, 133–136 (1967).
Google Scholar - Santos, de Souza: The ultrastructure of mucous granules from starfish J. Ultrastruct. Res. 16, 259–268 (1966). tube feet.
Google Scholar - Taylor, E. W., Thomas, J. N.: Membrane (contact) digestion in three species of tapeworm, Hymenolepis diminuta, Hymenolepis microstoma and Moniezia expansa. Parasitology 58, 535–546 (1968).
Google Scholar - Threadgold, L. T.: An electron microscope study of the tegument and associated structures of Proteocephalus pollanicoli. Parasitology 55, 467–472 (1965).
Google Scholar - — The ultrastructure of the animal cell. Oxford: Pergamon Press 1967.
Google Scholar - Watson, E. E.: The genus Gyrocotyle and its significance for problems of cestode structure and phylogeny. Univ. Calif. Publs. Zool. 6, 353–468 (1911).
Google Scholar - Williams, H. H.: Phyllobothrium piriei sp. nov. (Cestoda: Tetraphyllidea) from Raja naevus with a comment on its habitat and mode of attachment. Parasitology 58, 929–937 (1968).
Google Scholar - Wilson, T. H.: In: The cellular functions of membrane transport (J. F. Hoffman ed.) New Jersey: Prentice-Hall 1963.
Google Scholar
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Authors and Affiliations
- Department of Zoology, King's College, Strand, W. C. 2, London, England
Kathleen M. Lyons
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Lyons, K.M. The fine structure of the body wall of Gyrocotyle urna.Z. F. Parasitenkunde 33, 95–109 (1969). https://doi.org/10.1007/BF00259511
- Received: 14 April 1969
- Issue date: June 1969
- DOI: https://doi.org/10.1007/BF00259511