Vitellogenesis and vitelline system in the pseudophyllidean tapeworm Paraechinophallus japonicus: ultrastructural and cytochemical studies (original) (raw)

Folia Parasitologica 54[1] 43-50 (2007) | DOI: 10.14411/fp.2007.006

1Institute of Parasitology, Biology Centre, Academy of Sciences of the Czech Republic, Brani�ovsk� 31, 370 05 �esk� Bud�jovice, Czech Republic

2Laboratoire Parasites et Ecosystèmes M�diterran�ens, Facult� des Sciences et Techniques, Universit� de Corse, Campus Grossetti, 20250 Corte, France

3Institute of Biology of Inland Waters, Russian Academy of Sciences, 152742 Borok, Yaroslavl Province, Russia

4Faculty of Biological Sciences, University of South Bohemia, Brani�ovsk� 31, 370 05 �esk� Bud�jovice, Czech Republic

5Institute of Aquaculture, University of Stirling, Stirling, FK9 4LA, UK

The vitellogenesis of Paraechinophallus japonicus (Yamaguti, 1934), the first pseudophyllidean tapeworm of the family Echinophallidae studied using transmission electron microscope, is described on the basis of ultrastructural observations of specimens from the benthopelagic fish Psenopsis anomala (Temminck et Schlegel, 1844) (Perciformes: Centrolophidae). The process of vitellogenesis in P. japonicus follows the same general pattern observed in other tapeworms. Five stages of vitellocyte development have been distinguished. The first stage corresponds to immature cells containing ribosomes and mitochondria. The second stage of development is characterized by the appearance of granular endoplasmic reticulum and Golgi complexes, formation of shell globules and lipid droplets at the periphery of the cell cytoplasm. Vitellocyte of the third stage presents accumulation of shell globules and lipid droplets. During the fourth stage, shell globule clusters are formed, and lipid droplets and rosettes of α-glycogen are accumulated. Mature vitelline cells are characterized by a great number of lipid droplets with glycogen in the centre of the cytoplasm, whereas shell globule clusters are situated more peripherally. The interstitial tissue of vitelline follicles of P. japonicus is syncytial with long cytoplasmic projections extending between vitelline cells. The presence of a large amount of lipid droplets in the vitelline cytoplasm within the eggs of P. japonicus may be related to egg accumulation in the uterine sac.

Keywords: Cestoda, Pseudophyllidea, Paraechinophallus japonicus, vitelline system, vitellogenesis, ultrastructure

Received: June 9, 2006; Accepted: September 12, 2006; Published: March 1, 2007 Show citation

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Levron, C., Poddubnaya, L.G., Kuchta, R., Freeman, M., & Scholz, T. (2007). Vitellogenesis and vitelline system in the pseudophyllidean tapeworm Paraechinophallus japonicus: ultrastructural and cytochemical studies. Folia Parasitologica,�54(1),�43-50. doi:�10.14411/fp.2007.006

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