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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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