Ultrastructure of spermiogenesis and thespermatozoon of Mesocestoides litteratus (Cestoda,Mesocestoididae)

Miquel, Jordi; Feliú, Carlos; Marchand, Bernard

doi:10.1016/s0020-7519(98)00202-1

Cited by 59 publications

(74 citation statements)

References 25 publications

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“…TetraphyllideaPhyllobothriidae and Caryophyllidea typically present Type 2 spermiogenesis. Subsequently, Stoitsova et al (1995) reported Type 2 spermiogenesis in the Tetrabothriidea (Tetrabothrius erostris) and Miquel et al (1999Miquel et al ( , 2007 also reported Type 2 spermiogenesis in the cyclophyllideans mesocestoidids Mesocestoides litteratus and M. lineatus. According to Bâ and Marchand (1995), cyclophyllideans present either Type 3 or Type 4 spermiogenesis.…”

Section: Spermiogenesismentioning

confidence: 99%

Ultrastructure of spermatogenesis of Taenia taeniaeformis (Batsch, 1786) (Cestoda, Cyclophyllidea, Taeniidae) and comparison of spermatological characters in the family Taeniidae Ludwig, 1886

Miquel

Świderski²,

Foronda³

et al. 2009

Acta Parasitologica

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The ultrastructure of spermatogenesis of Taenia taeniaeformis is described for the first time by means of transmission electron microscopy (TEM). Mature testes contain all stages of spermatogenesis; primary spermatogonia are usually situated at the periphery and mature spermatozoa in the centre of testes. The general process is similar to that described in other cestodes. Six incomplete, synchronic cytokineses occur: four mitotic and two meiotic cell divisions. All these divisions occur simultaneously, resulting in a rosette cluster of four tertiary spermatogonia, then eight quaternary spermatogonia, and subsequently sixteen primary spermatocytes. All of these enter into a growth period and their enlarged nuclei move to the periphery of cells of the rosettes. The first meiotic division forms thirty-two secondary spermatocytes and after the second meiotic division, there are sixty-four spermatids. Spermiogenesis in T. taeniaeformis corresponds to the Bâ and Marchand's Type 3 and begins with the formation of a differentiation zone in the form of a conical projection of cytoplasm delimited by a ring of arching membranes and surrounded by submembranous cortical microtubules. Within this area, there are two centrioles, orthogonally disposed, and vestigial striated rootlets. Only one of the centrioles develops a flagellum that grows externally to the cytoplasmic extension. Posteriorly, a flagellar rotation inferior to 90º occurs and the flagellum becomes parallel to the cytoplasmic extension. Later, the two processes fuse during the so-called proximodistal fusion. The nucleus elongates and moves into the cytoplasmic extension. In the final stage of spermiogenesis, a single crested body appears at the base of the differentiating spermatozoon. Finally, the ring of arching membranes constricts and the young spermatozoon detaches from the residual cytoplasm. Ultrastructural aspects of spermatogenesis are compared with that of other cestodes studied to date, particularly of the family Taeniidae.

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Section: Spermiogenesismentioning

confidence: 99%

Ultrastructure of spermatogenesis of Taenia taeniaeformis (Batsch, 1786) (Cestoda, Cyclophyllidea, Taeniidae) and comparison of spermatological characters in the family Taeniidae Ludwig, 1886

Miquel

Świderski²,

Foronda³

et al. 2009

Acta Parasitologica

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“…one Diphyllobothriidea (Justine 1986), in three Trypanorhyncha (Miquel and Świderski 2006, Miquel et al 2007a, Marigo et al 2011, in four Proteocephalidea (Bruňanská et al 2003a(Bruňanská et al , b, 2004b and in two mesocestoidids (Miquel et al 1999(Miquel et al , 2007b. The mature spermatozoon of the five Onchobothriidae studied until now presents two axonemes of the 9 + "1" trepaxonematan pattern (see Table I).…”

Section: Spermatozoonmentioning

confidence: 93%

“…This is the case of four Caryophyllidea (Arafa and Hamada 2004, Gamil 2008, Bruňanská 2009and Yoneva et al 2011), three Spathebothriidea (MacKinnon and Burt 1984, Bruňanská et al 2006, Bruňan-ská and Poddubnaya 2010, three Trypanorhyncha (Miquel and Świderski 2006, Miquel et al 2007a, Marigo et al 2011, one Bothriocephalidea , three Diphyllobothridea (Justine 1986, Levron et al 2006a, 2009, five Proteocephalidea (Bâ and Marchand 1994;Bruňanská et al 2003aBruňanská et al , b, 2004b and two mesocestoidid Cyclophyllidea (Miquel et al 1999(Miquel et al , 2007b. The number of cortical microtubules forming the arc-like row in all these studies varies between three and eighteen depending on the level of section.…”

Section: Spermatozoonmentioning

confidence: 99%

Spermatological characters of Acanthobothrium crassicolle Wedl, 1855 (Tetraphyllidea, Onchobothriidae), a parasite of the common stingray Dasyatis pastinaca

Marigo¹,

Eira²,

Bâ

et al. 2011

Acta Parasitologica

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We describe the spermiogenesis process and the ultrastructural characters of the spermatozoon of Acanthobothrium crassicolle by means of transmission electron microscopy, including cytochemical analysis for glycogen. Spermiogenesis in A. crassicolle begins with the formation of the differentiation zone that contains two centrioles associated with striated rootlets and an intercentriolar body. The latter is formed by one electron-dense layer. The centrioles develop into two free flagella that first grow orthogonally to a median cytoplasmic process and then undergo flagellar rotation becoming parallel to that median cytoplasmic process. After flagellar rotation only one of the flagella completes its growth and both short and long flagella undergo proximodistal fusion with the median cytoplasmic process. In the final stages of spermiogenesis, the nucleus becomes filiform and migrates into the spermatid body. Later, the ring of arched membranes constricts and the spermatozoon is liberated from the residual cytoplasm. The ultrastructural organization of the spermatozoon of A. crassicolle follows the general pattern of spermatozoa of the other Tetraphyllidea-Onchobothriidae species, but exhibits some differences. It is filiform, tapered at both extremities and lacks mitochondrion. It contains two axonemes of unequal length showing the 9 + "1" pattern of Trepaxonemata, a nucleus, parallel cortical microtubules and electron-dense granules of glycogen. The anterior extremity of the male gamete contains a single crested body surrounding a thin and long apical cone. This type of apical cone has never been described in a tetraphyllidean spermatozoon. Another particularity is the presence of a single electron-dense microtubule at the vertex of the crested body.

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“…The type II spermiogenesis is described in cestodes belonging to the Tetraphyllidea-Phyllobothriidae ( (Miquel et al 1999(Miquel et al , 2007a and is basically characterised by the formation of two centrioles but only one of them gives a flagellum. The single flagellum growth orthogonally, rotates and fuses with the cytoplasmic extension.…”

Section: Spermiogenesismentioning

confidence: 99%

“…The type I spermatozoon exhibited by the species of Spathebothriidea Poddubnaya 2010) Diphyllobothriidea (Levron et al 2006a(Levron et al , 2009 (Świderski and Mokhtar-Maamouri 1980;Bruňanská et al 2002;Levron et al 2005Levron et al , 2006bLevron et al , 2006cBâ et al 2007;Šípková et al 2010, Tetraphyllidea-Onchobothriidae (Mokhtar-Maamouri and (Świderski and Eklu-Natey 1978;Sène et al 1997;Bruňanská et al 2003aBruňanská et al , 2003bBruňanská et al , 2004aBruňanská et al , 2004b and Diphyllidea (Azzouz-Draoui 1985) is characterized by the presence of two axonemes, helical crested body, parallel nucleus and parallel cortical microtubules. The type IV spermatozoon, characterized by the presence of one axoneme, helical crested body, parallel nucleus and parallel cortical microtubules, is described in some TetraphyllideaPhyllobothriidae (Mokhtar-Maamouri 1979;MacKinnon and Burt 1984), in the Mesocestoididae cyclophyllideans (Miquel et al 1999(Miquel et al , 2007a and in certain Diphyllidea there are some problematic spermatozoa difficult to place. It is the case of Sandonella sandoni (Bâ and Marchand 1984), a Proteocephalidea which presents only one axoneme, or the commented case of Phyllobothium lactuca (Sène et al 1999) or Trilocularia acanthiaevulgaris (Mahendrasingam et al 1984), two Phyllobothriidae which present two axonemes.…”

Section: Spermatozoonmentioning

confidence: 99%

Spermiogenesis and spermatozoon ultrastructure of the diphyllidean cestode Echinobothrium euterpes (Neifar, Tyler and Euzet 2001) Tyler 2006, a parasite of the common guitarfish Rhinobatos rhinobatos

et al. 2011

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Ultrastructure of spermiogenesis and thespermatozoon of Mesocestoides litteratus (Cestoda,Mesocestoididae)

Cited by 59 publications

References 25 publications

Ultrastructure of spermatogenesis of Taenia taeniaeformis (Batsch, 1786) (Cestoda, Cyclophyllidea, Taeniidae) and comparison of spermatological characters in the family Taeniidae Ludwig, 1886

Ultrastructure of spermatogenesis of Taenia taeniaeformis (Batsch, 1786) (Cestoda, Cyclophyllidea, Taeniidae) and comparison of spermatological characters in the family Taeniidae Ludwig, 1886

Spermatological characters of Acanthobothrium crassicolle Wedl, 1855 (Tetraphyllidea, Onchobothriidae), a parasite of the common stingray Dasyatis pastinaca

Spermiogenesis and spermatozoon ultrastructure of the diphyllidean cestode Echinobothrium euterpes (Neifar, Tyler and Euzet 2001) Tyler 2006, a parasite of the common guitarfish Rhinobatos rhinobatos

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