Ultrastructural studies on the reproductive system of Gyrocotylidea and Amphilinidea (Cestoda) (original) (raw)
Summary
The vitellaria, vitellocyte development and vitelloduct of Gyrocotyle urna are described at the ultrastructural level. Vitellar follicles are surrounded by an extracellular lamina; vitellocytes and the periphery of the follicles are enclosed by a cytoplasmic sheath. Immature vitellocytes are spherical and show a high nucleus-to-plasma ratio. During maturation of vitellocytes their cytoplasmic content increases and numerous dictyosomes, endoplasmic reticulum, egg-shell granules and lipid droplets are formed. Lipid droplets and egg-shell granules fill most of the volume of mature vitellocytes. The vitelloduct is ciliated and shows intraepithelial nuclei and intraluminal folds. No cell borders have been found within the vitelloduct. Vitellogenesis and the vitelloduct morphology of Gyrocotyle are compared with those of other parasitic Plathelminthes.
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Abbreviations
I :
immature vitellocyte
II :
maturing vitellocyte
III :
mature vitellocyte
Az :
cytoplasmic sheath surrounding the vitellocytes and the follicle
bb :
basal body
ci :
cilia of the vitelloduct
ld :
lipid droplet
mi :
mitochondrium
nu :
nucleus
rer :
rough endoplasmic reticulum
sg :
egg-shell granulum
ve :
vesicles
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Author notes
- W. E. R. Xylander
Present address: Institut für Allgemeine und Spezielle Zoologie, Stephanstrasse 24, D-6300, Giessen, Federal Republic of Germany
Authors and Affiliations
- II. Zoologisches Institut und Museum der Universität, Berliner Strasse 28, D-3400, Göttingen, Federal Republic of Germany
W. E. R. Xylander
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Xylander, W.E.R. Ultrastructural studies on the reproductive system of Gyrocotylidea and Amphilinidea (Cestoda).Zoomorphology 107, 293–297 (1987). https://doi.org/10.1007/BF00312175
- Received: 19 June 1987
- Issue date: December 1987
- DOI: https://doi.org/10.1007/BF00312175