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The rostellar tegumentary cytoplasm of the metacestode of Hymenolepis diminuta (Cyclophyllidea: Cestoda)

Published online by Cambridge University Press:  06 April 2009

K. Sylvia Richards  and
C. Arme
K. Sylvia Richards
Affiliation:
Parasitology Research Laboratory, Department of Biological Sciences, University of Keele, Staffordshire ST5 5BG
C. Arme
Affiliation:
Parasitology Research Laboratory, Department of Biological Sciences, University of Keele, Staffordshire ST5 5BG
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Summary

Prior to scolex-retraction, the tegumentary syncytial cytoplasm of the presumptive rostellar region of Hymenolepis diminuta (from Tenebrio molitor kept at 26 °C) is indistinguishable from that of the rest of the cysticercoid. At 1 day after scolex-retraction differentiation of the rostellum has commenced, the tegumentary cytoplasm containing a small number of membrane-bound, ovoid, electron-dense granules which are absent from all other tegumentary regions of the metacestode. By 3 days after scolex-withdrawal there is a substantial increase in the number of ovoid granules within the rostellar tegumentary syncytium and the Golgi systems of the rostellar cytons are highly secretory. At this stage, although the cyst wall tissues are not fully developed, the metacestode is infective. This early and rapid development of the rostellar region presumably enables the ‘adult’ condition to be readily attained. In older metacestodes there is a progressive accumulation of ovoid granules within the rostellar tegumentary cytoplasm, accompanied by a decrease within the rostellar cytons. At 23 days following scolex-retraction the rostellar syncytium has the appearance of that of the adult tapeworm. The rostellar cytons also produce tegumentary discs and vesicles and are therefore regarded as homologous to the other tegumentary cytons of the metacestode.

Type
Research Article
Information
Parasitology , Volume 86 , Issue 1 , February 1983 , pp. 83 - 88
Copyright
Copyright © Cambridge University Press 1983

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References

Allison, V. F., Ubelaker, J. E. & Cooper, N. B. (1972). The fine structure of the cysticercoid of Hymenolepis diminuta. II. The inner wall of the capsule. Zeitschrift für Parasitenkunde 30, 137–47.CrossRefGoogle Scholar
Caley, J. (1974). The functional significance of scolex retraction and subsequent cyst formation in the cysticercoid larva of Hymenolepis microstoma. Parasitology 68, 207–27.CrossRefGoogle ScholarPubMed
Cooper, N. B., Allison, V. F. & Ubelaker, J. E. (1975). The fine structure of the cysticercoid of Hymenolepis diminuta. III. The scolex. Zeitschrift für Parasitenkunde 46, 229–39.CrossRefGoogle ScholarPubMed
Krasnoshchekov, G. P., Moczoń, T. & Pluzhnikov, L. T. (1979). Ultrastructure of the cyst of Hymenolepis diminuta larvae. Folia Parasitologica (Praha) 26, 245–51.Google ScholarPubMed
Lumsden, R. D. & Specian, R. (1980). The morphology, histology and fine structure of the adult stage of the cyclophyllidean tapeworm Hymenolepis diminuta. In Biology of the Tapeworm Hymenolepis diminuta, (ed. Arai, H. P.), pp. 157–280. New York and London: Academic Press.CrossRefGoogle Scholar
Richards, K. S. & Arme, C. (1981). The ultrastructure of the scolex-neck syncytium, neck cells and frontal gland cells of Caryophyllaeus laticeps (Caryophyllidea: Cestoda). Parasitology 83, 477–87.CrossRefGoogle Scholar
Richards, K. S. & Arme, C. (1982). The microarchitecture of the structured bodies in the tegument of Caryophyllaeus laticeps (Caryophyllidea: Cestoda). Journal of Parasitology 68, 425–32.CrossRefGoogle Scholar
Specian, R. D. & Lumsden, R. D. (1980). The microanatomy and fine structure of the rostellum of Hymenolepis dirninuta. Zeitschrift für Parasitenkunde 63, 71–88.CrossRefGoogle Scholar
Specian, R. D. & Lumsden, R. D. (1981). Histochemical, cytochemical and autoradiographic studies on the rostellum of Hymenolepis dirninuta. Zeitschrift für Parasitenkunde 64, 335–45.CrossRefGoogle Scholar
Ubelaker, J. E. (1980). Structure and ultrastructure of the larvae and metacestodes of Hymenolepis dirninuta. In Biology of the Tapeworm Hymenolepis dirninuta, (ed. Arai, H. P.), pp. 59–156. New York and London: Academic Press.Google Scholar
Voge, M. & Heyneman, D. (1957). Development of Hymenolepis nana and Hymenolepis dirninuta (Cestoda: Hymenolepididae) in the intermediate host Tribolium confusum. University of California Publications in Zoology 59, 549–80.Google Scholar
Webb, R. A. & Davey, K. G. (1975). Ultrastructural changes in an unciliated sensory receptor during activation of the metacestode of Hymenolepis microstoma. Tissue and Cell 7, 519–24.CrossRefGoogle Scholar