Ultrastructure comparée du spermatozoïde des cestodes. Relations avec la phylogénèse

Euzet, Louis; Świderski, Zdzisław; Mokhtar-Maamouri, F.

doi:10.1051/parasite/1981563247

Cited by 91 publications

(72 citation statements)

References 15 publications

(20 reference statements)

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“…During the last half-century, ultrastructural descriptions of spermatozoa were used as valuable tools for phylogenetic inference in the flatworms (Platyhelminthes), particularly in the tapeworms (Eucestoda) [1][2][3][4][5][6][7][8][9][10], but also in the Monogenea [4,11]. Considering digeneans, the increase of this kind of studies has motivated the analysis of spermiological data, particularly those related to the mature spermatozoon, in order to establish different types of spermatozoa according to their ultrastructural organization.…”

Section: Introductionmentioning

confidence: 99%

Ultrastructural characters of the spermatozoon of the digenean Hypocreadium caputvadum Kacem et al., 2011 (Lepocreadioidea: Lepocreadiidae), an intestinal parasite of Balistes capriscus in Tunisia

Kacem¹,

Bakhoum

Eira

et al. 2012

Comptes Rendus. Biologies

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Section: Introductionmentioning

confidence: 99%

Ultrastructural characters of the spermatozoon of the digenean Hypocreadium caputvadum Kacem et al., 2011 (Lepocreadioidea: Lepocreadiidae), an intestinal parasite of Balistes capriscus in Tunisia

Kacem¹,

Bakhoum

Eira

et al. 2012

Comptes Rendus. Biologies

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“…In fact, Mahendrasingam et al (1989) describe two axonemes in the spermatozoon of Trilocularia acanthiaevulgaris, while in the remaining studied Phyllobothriidae namely Phyllobothrium gracile (Mokhtar-Maamouri 1979) and Pseudanthobothrium hanseni (MacKinnon and Burt 1984) there is only one axoneme, according to the spermatozoon pattern assigned to this family (see Levron et al 2010). Such differences evidenced within the same family may cause controversies for the phylogeny of this group because the presence of a single axoneme should be considered an evolved character (Euzet et al 1981). Moreover, the number of axonemes in the mature spermatozoon constitutes one of the principal characters considered by Levron et al (2010) for the distinction of the Eucestoda spermatozoa.…”

Section: Spermatozoonmentioning

confidence: 99%

“…It is now widely accepted that ultrastructural spermatological characters contribute to a better understanding of relationships within the Platyhelminthes (Euzet et al 1981;Justine 1991Justine , 1995Justine , 1998Justine , 2001Hoberg et al 1997Hoberg et al , 2001Olson et al 2001;Bruňanská 2010;Levron et al 2010). To our knowledge, there are ultrastructural data on the spermiogenesis and/or spermatozoon of four onchobothriids.…”

Section: Introductionmentioning

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 usefulness of ultrastructural data of spermiogenesis and the spermatozoon to elucidate the phylogenetic relationships within the Platyhelminthes has been demonstrated by several authors (Euzet et al 1981;Justine 1991Justine , 1998Justine , 2001Bâ and Marchand 1995;Levron et al 2010). To our knowledge, the spermatological characters of only 13 species of the former "Pseudophyllidea" have been studied, including 10 bothriocephalideans and three diphyllobothriideans.…”

Section: Introductionmentioning

confidence: 99%

Spermiogenesis and spermatozoon ultrastructure of the bothriocephalidean cestode Clestobothrium crassiceps (Rudolphi, 1819), a parasite of the teleost fish Merluccius merluccius (Gadiformes: Merlucciidae)

et al. 2011

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Spermiogenesis and the ultrastructure of the spermatozoon of the bothriocephalidean cestode Clestobothrium crassiceps (Rudolphi, 1819), a parasite of the teleost fish Merluccius merluccius (Linnaeus, 1758), have been studied by means of transmission electron microscopy. Spermiogenesis involves firstly the formation of a differentiation zone. It is characterized by the presence of two centrioles associated with striated rootlets, an intercentriolar body and an electron-dense material in the apical region of this zone. Later, two flagella develop from the centrioles, growing orthogonally in relation to the median cytoplasmic process. Flagella then undergo a rotation of 90° until they become parallel to the median cytoplasmic process, followed by the proximodistal fusion of the flagella with the median cytoplasmic process. The nucleus elongates and afterwards it migrates along the spermatid body. Spermiogenesis finishes with the appearance of the apical cone surrounded by the single helical crested body at the base of the spermatid. Finally, the narrowing of the ring of arched membranes detaches the fully formed spermatozoon. The mature spermatozoon of C. crassiceps is filiform and contains two axonemes of the 9+"1" trepaxonematan pattern, a parallel nucleus, parallel cortical microtubules and electron-dense granules of glycogen. The anterior extremity of the gamete exhibits a short electron-dense apical cone and one crested body, which turns once around the sperm cell. The first axoneme is surrounded by a ring of thick cortical microtubules that persist until the appearance of the second axoneme. Later, these thick cortical microtubules disappear and thus, the mature spermatozoon exhibits two bundles of thin cortical microtubules. The posterior extremity of the male gamete presents only the nucleus. Results are discussed and compared particularly with the available ultrastructural data on the former "pseudophyllideans". Two differences can be stablished between spermatozoa of Bothriocephalidea and Diphyllobothriidea, the type of spermatozoon (II vs I) and the presence/absence of the ring of cortical microtubules.

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Ultrastructure comparée du spermatozoïde des cestodes. Relations avec la phylogénèse

Cited by 91 publications

References 15 publications

Ultrastructural characters of the spermatozoon of the digenean Hypocreadium caputvadum Kacem et al., 2011 (Lepocreadioidea: Lepocreadiidae), an intestinal parasite of Balistes capriscus in Tunisia

Ultrastructural characters of the spermatozoon of the digenean Hypocreadium caputvadum Kacem et al., 2011 (Lepocreadioidea: Lepocreadiidae), an intestinal parasite of Balistes capriscus in Tunisia

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

Spermiogenesis and spermatozoon ultrastructure of the bothriocephalidean cestode Clestobothrium crassiceps (Rudolphi, 1819), a parasite of the teleost fish Merluccius merluccius (Gadiformes: Merlucciidae)

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