Ultrastructure studies of Proteocephalus longicollis (Cestoda, Proteocephalidea) : transmission electron microscopy of scolex glands

The ultrastructure of two types of secretory glands in the scolex of preadults of Proteocephalus longicollis is described for the first time in the present report. The gland cells contain extensive cisternae of granular endoplasmic reticulum and Golgi complexes, which participate in the production o...

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Published inParasitology research (1987) Vol. 86; no. 9; pp. 717 - 723
Main Authors BRUNANSKA, M, FAGERHOLM, H.-P, GUSTAFSSON, M. K. S
Format Journal Article
LanguageEnglish
Published Berlin Springer 01.09.2000
Subjects
Animals
Biological and medical sciences
Cestoda - growth & development
Cestoda - ultrastructure
Eccrine Glands - growth & development
Eccrine Glands - ultrastructure
Fundamental and applied biological sciences. Psychology
Invertebrates
Life cycle. Embryology. Development
Microscopy, Electron
Nemathelminthia. Plathelmintha
Physiology. Development
Salmonidae - parasitology
Secretory Vesicles - ultrastructure
Glandular cell
Life history
Plathelmintha
Parasite
Secretory cell
Scolex
Zoopathogen
Cestoda
Transmission electron microscopy
Ultrastructure
Morphology
Helmintha
Developmental stage
Invertebrata
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Summary:The ultrastructure of two types of secretory glands in the scolex of preadults of Proteocephalus longicollis is described for the first time in the present report. The gland cells contain extensive cisternae of granular endoplasmic reticulum and Golgi complexes, which participate in the production of secretory globules. Type I scolex glands produce electron-dense globules of various size. The secretory globules enter the secretory canal, openings of which were not observed in the preadults. The secretory product of type I was found at the inner sucker surface and in the tegument of the sucker edges. In addition, electron-dense globules in adult worms are secreted via an eccrine mechanism. Type II scolex glands are characterized by secretory globules of lower electron density and occur mainly in preadults. The electron-lucent, membrane-bound secretory globules are transported via microtubule-lined ducts opening to the exterior at the tegumental surface. Secretory globules of type II are released by an eccrine process.
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ISSN:0932-0113
1432-1955
DOI:10.1007/PL00008557