Fine structure of the female reproductive ducts of Cyathocephalus truncatus (Cestoda: Spathebothriidea), from salmonid fish (original) (raw)

Folia Parasitologica 52[4] 323-338 (2005) | DOI: 10.14411/fp.2005.045

1Institute of Biology of Inland Waters, Russian Academy of Sciences, 152742 Borok, Yaroslavl Province, Russia

2Department of Biological Sciences, State University of New York, Albany, NY 12222, USA

3Institute of Parasitology, Academy of Sciences of the Czech Republic, Brani�ovsk� 31, 370 05 �esk� Bud�jovice, Czech Republic

4Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 01 Ko�ice, Slovakia

The fine structure of the ovary, ovicapt, oviduct, fertilisation canal, vitelline ducts, vitelline reservoir, ovovitelline duct, ootype and Mehlis' gland, and proximal, middle and distal parts of the uterus of the spathebothriidean cestode, Cyathocephalus truncatus (Pallas, 1781), from salmoniform fish, has been studied for the first time by transmission electron microscopy (TEM). Emphasis was given to characteristics which might shed light on the unclarified phylogenetic position of spathebothriideans, belonging among the most basal tapeworms (Eucestoda). New for cestodes is the finding of a multinucleate cell that plugs the ovicapt lumen. The morphology of the proximal part of the oviduct resembles that of the pseudophyllidean tapeworm Diphyllobothrium latum. After fertilisation in the fertilisation canal, vitellocytes of C. truncatus become associated with fertilized oocytes in the ovovitelline duct. Only one type of Mehlis' gland secretory cell is present. The eggs with electron-dense eggshells containing large pores first appear in the proximal part of the uterus. The middle portion of the uterus has well-developed uterine glands. The distal portion of the uterus has apical microtriches. Ultrastructural data on the female genital system of C. truncatus are compared and discussed with those for other cestodes. However, on the basis of available ultrastructural data it is not possible to conclude whether the Spathebothriidea are phylogenetically closer to the Caryophyllidea or to the Pseudophyllidea.

Keywords: Cyathocephalus truncatus, ultrastructure, ovary, uterus, associated female ducts and glands, cestode evolution

Received: August 5, 2004; Accepted: November 15, 2004; Published: September 1, 2005 Show citation

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Poddubnaya, L.G., Mackiewicz, J.S., Bru�ansk�, M., & Scholz, T. (2005). Fine structure of the female reproductive ducts of Cyathocephalus truncatus (Cestoda: Spathebothriidea), from salmonid fish. Folia Parasitologica,�52(4),�323-338. doi:�10.14411/fp.2005.045

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