Ultrastructure of intrauterine eggs: Evidence of early ovoviviparity in the caryophyllidean cestode Wenyonia virilis Woodland, 1923

• Autorzy: Mlocicki D , Swiderski Z. , Mackiewicz J.S. , Ibraheem M.H.
• Języki publikacji: EN

Abstrakty

EN

Ultrastructural evidence for early intraurerine embryonic development of Wenyonia virilis is presented. At the initial stage of egg formation, the fertilized oocyte or ovum is surrounded by numerous vitellocytes and newly formed eggshell. Individual vitellocytes undergo progressive fusion into a vitelline syncytium. During cleavage divisions, three types of blastomeres are formed: macromeres, mesomeres and micromeres. Two large macromeres contain a large nucleus with spherical nucleolus and numerous small heterochromatin islands dispersed in moderately electron-dense nucleoplasm. The granular cytoplasm shows a few large mitochondria. Medium-sized mesomeres contain a spherical nucleus with numerous heterochromatin islands, adjacent to the nuclear envelope, and a prominent electron-dense nucleolus. Their nuclei are embedded in granular cytoplasm with a few large and numerous small mitochondria and Golgi complexes. The small micromeres are characterized by presence of spherical nucleoli with large areas of highly condensed heterochromatin and a few islands of granular electron-lucent nucleoplasm. Their granular cytoplasm shows a few small lipid droplets and several spherical mitochondria. Majority of micromeres give rise to the hexacanth but many of them also undergo degeneration or apoptosis. Both mesomeres and macromeres are engaged in the formation of the oncospheral envelopes. The outer envelope is formed by a fusion of two macromeres whereas the inner envelope originates from a fusion of mesomeres. The intrauterine eggs of W. virilis usually contain an embryo at the early preoncopheral phase of development and possesses three primary envelopes: (1) thick eggshell; (2) thin cytoplasmic layer of the outer envelope and (3) inner envelope. Based on embryonic development, egg type and life-cycle characteristics, caryophyllideans tend to show closer affinities to spathebothriideans than to the former pseudophyllideans.

Słowa kluczowe

EN

ultrastructure; intrauterine egg; egg formation; ovoviviparity; caryophyllidean cestode; Wenyonia virilis; oocyte; vitellocyte; blastomere; granular cytoplasm; mitochondrion; heterochromatin

• Wydawca: -
• Czasopismo: Acta Parasitologica
• Rocznik: 2010
• Tom: 55
• Numer: 4
• Opis fizyczny: p.349-358,fig.,ref.

Twórcy

autor

Mlocicki D

• Polish Academy of Sciences, 51/55 Twarda Street, 00-818 Warsaw, Poland

autor

Swiderski Z.

autor

Mackiewicz J.S.

autor

Ibraheem M.H.

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