Functional aspects of the intercentriolar body in the spermiogenesis of Nematoplana coelogynoporoides (Plathelminthes, Proseriata)

Sopott‐Ehlers, Beate

doi:10.1007/bf00312191

Cited by 27 publications

(13 citation statements)

References 20 publications

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“…The role of this intercentriolar body is a subject of debate. Several authors suggest it participates in the (Burton 1972;Grant et al 1976;Sopott-Ehlers 1990), while others give it a role in the construction of the cortical microtubules (Rees 1979).…”

Section: Discussionmentioning

confidence: 99%

Ultrastructure of spermiogenesis and the spermatozoon of Monorchis parvus Looss, 1902 (Digenea, Monorchiidae), a parasite of Diplodus annularis (Pisces, Teleostei)

Levron

Ternengo

Marchand

2004

Parasitology Research

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The present paper describes the characteristic ultrastructural features of spermiogenesis and the spermatozoon of Monorchis parvus (Trematoda, Digenea, Monorchiidae). This spermiogenesis is characterized by a flagellar rotation of about 120 degrees and the formation of a novel ultrastructural element: a centriolar extension. It nevertheless follows the general pattern of digeneans. It begins with the formation of a differentiation zone, comprising striated rootlets associated with two centrioles and an intercentriolar body. The mature spermatozoon presents features allowing the distinction between M. parvus and other digenetic trematodes. It possesses an original anterior extremity. The two central elements of the axonemes appear prior to the peripheral doublets. The external ornamentations of the cell membrane are formed parallel to the central elements. Another peculiarity of the male gamete is the presence of two mitochondria. M. parvus, therefore, differs distinctly from other digenetic trematodes.

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Section: Discussionmentioning

confidence: 99%

Ultrastructure of spermiogenesis and the spermatozoon of Monorchis parvus Looss, 1902 (Digenea, Monorchiidae), a parasite of Diplodus annularis (Pisces, Teleostei)

Levron

Ternengo

Marchand

2004

Parasitology Research

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“…Their role in the spermiogenesis is an important point of (Cifrian et al 1993). They could participate in the elongation of the spermatid (Soppot -Ehlers 1990), in the formation of cortical microtubules (Stitt and Fairweather 1990) The mature spermatozoon of D. brusinae exhibits the usual structures found in the great majority of digeneans. It is characterized by the presence of two axonemes of the 9+''1'' pattern typical of Trepaxonemata (Ehlers 1984), mitochondrion, nucleus and cortical microtubules (Burton 1972;Jamieson and Daddow 1982;Miquel et al 2000;Ndiaye et al 2002Ndiaye et al , 2003aNdiaye et al , 2003bNdiaye et al , 2004Levron et al 2003Levron et al , 2004.…”

Section: Discussionmentioning

confidence: 99%

Spermiogenesis and sperm ultrastructure of Diphterostomum brusinae (Digenea, Zoogonidae), a parasite of Diplodus annularis (Pisces, Teleostei)

2004

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This paper constitutes the first ultrastructural study of spermiogenesis and the spermatozoon of a Digenea belonging to the family Zoogonidae, Diphterostomum brusinae. Spermiogenesis follows the general pattern found in the digeneans. It begins with the formation of a differentiation zone in the spermatid. The two centrioles give rise to flagella. These two flagella undergo a rotation of 90 degrees and fuse with the median cytoplasmic process. The proximo-distal fusion occurs at the level of attachment zones. The mature spermatozoon of D. brusinae presents all the features found in the digeneans gametes: two axonemes, mitochondrion, nucleus and two bundles of parallel cortical microtubules. Nevertheless, several characteristics distinguish the spermatozoon of D. brusinae from other digeneans, in particular the external ornamentations of the plasma membrane and the anterior and posterior extremities. The description of the ultrastructural features of reproduction in this species would contribute to the understanding of the phylogenetic relationships in the Zoogonidae family.

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“…Together with the ICB, it is supposed to be characteristic of microtubular organisation centres (Burton 1972;Halton and Hardcastle 1976). In addition, the ICB is supposed either to be associated with the complex central unit of axonemes (Rees 1979) or to play a role in cell elongation and/or the maintenance of the MCP structure (Sopott-Ehlers 1990).…”

Section: Discussionmentioning

confidence: 99%

Spermiogenesis in the pseudophyllid cestode Eubothrium crassum (Bloch, 1779)

Bruňanská

Nebesářová

Scholz

et al. 2001

Parasitology Research

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Spermiogenesis of the pseudophyllidean tapeworm Eubothrium crassum has been described by the aid of transmission electron microscopy for the first time. Initially, early spermatids form a distal cytoplasmic protrusion, a differentiation zone containing a small electron-dense, apically oriented region. Out of this region, two centrioles with rootlets develop. The centrioles become orientated in the same plane with the appearance of an intercentriolar body. Now, the long axes of the rootlets are parallel with each other and with the long axis of the nucleus. Two flagella of subsequently unequal length are formed very rapidly. Simultaneously, a median cytoplasmic process (MCP) develops distal to the flagella. Two arching membranes appear at the base of the differentiation zone. Each flagellum, still being in contact with an intercentriolar body, rotates to a position parallel with the MCP. The nucleus migrates very rapidly into the MCP at this stage. Subsequently, the two flagella fuse with the MCP. Finally, the basal bodies with the rootlets detach from the flagella, the intercentriolar body changes its structure and spermatids are pinched off from a condensing residual cytoplasm at the level of the arching membranes.

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Functional aspects of the intercentriolar body in the spermiogenesis of Nematoplana coelogynoporoides (Plathelminthes, Proseriata)

Cited by 27 publications

References 20 publications

Ultrastructure of spermiogenesis and the spermatozoon of Monorchis parvus Looss, 1902 (Digenea, Monorchiidae), a parasite of Diplodus annularis (Pisces, Teleostei)

Ultrastructure of spermiogenesis and the spermatozoon of Monorchis parvus Looss, 1902 (Digenea, Monorchiidae), a parasite of Diplodus annularis (Pisces, Teleostei)

Spermiogenesis and sperm ultrastructure of Diphterostomum brusinae (Digenea, Zoogonidae), a parasite of Diplodus annularis (Pisces, Teleostei)

Spermiogenesis in the pseudophyllid cestode Eubothrium crassum (Bloch, 1779)

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