Spermatological characters of the pseudophyllidean cestode Bothriocephalus scorpii (Müller, 1776)

Levron, Céline; Bruňanská, Magdaléna; Poddubnaya, Larisa G.

doi:10.1016/j.parint.2005.11.055

Cited by 37 publications

(50 citation statements)

References 31 publications

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“…The CB occurs in the more primitive two-axoneme spermatozoa of the Bothriocephalidea (Šípková et al, 2010), Tetraphyllidea -Onchobothriidae (Mokhtar-Maamouri & Świderski, 1975), TetraphyllideaPhyllobothriidae (Mahendrasingam et al, 1989), and Proteocephalidea (Bâ & Marchand, 1994;Sène et al, 1997;Bruňanská et al, 2003aBruňanská et al, , b, 2004a as well as in the evolved single-axoneme spermatozoa (mainly members of the Cyclophyllidea, see Justine, 1998). In both Eubothrium species, the CB is spiralized around the anterior part of the spermatozoon, including the cen- triolar level, thus resembling other bothriocephalideans (Levron et al, 2005;Levron et al, 2006a;Bâ et al, 2007;Šípková et al, 2010). The CB in E. rugosum consists of electron dense tubular structures, which were found also in Triaenophorus nodulosus and Bothriocephalus scorpii (Levron et al, 2005(Levron et al, , 2006a.…”

Section: Discussionmentioning

confidence: 99%

“…Recent reviews on the ultrastructure of the cestode spermatozoa, based on a large number of species, provide detailed information on various sperm components and their development (Bâ & Marchand, 1995;Justine, 1998;Watson, 1999;Bruňanská, 2010). Seven taxa of three families (Bothriocephalidae, Echinophallidae, Triaenophoridae) within the Bothriocephalidea have been studied so far (Świderski & Mokhtar-Maamouri, 1980;Bâ et al, 2007;Levron et al, 2006a, c;Šípková et al, 2010;Bruňanská et al, 2002;Levron et al, 2005). Data available show, that the ultrastructural organization of the mature spermatozoon of E. crassum differs from that in other bothriocephalideans.…”

Section: Introductionmentioning

confidence: 99%

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Ultrastructure of the mature spermatozoon of Eubothrium rugosum (Batsch, 1786) with a re-assessment of the spermatozoon ultrastructure of Eubothrium crassum (Bloch, 1779) (Cestoda: Bothriocephalidea)

et al. 2010

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257 SummaryThe ultrastructure of the mature spermatozoon of the bothriocephalidean tapeworm Eubothrium rugosum, a parasite of the burbot, Lota lota (L.), was studied by transmission electron microscopy for the first time. In addition, spermatozoon ultrastructure of Eubothrium crassum has been re-assessed. New is the finding, that the mature spermatozoa of both species of the genus Eubothrium exhibit essentially the same general morphology. They are filiform cells tapering at both extremities, and they possess the two axonemes with 9+"1" pattern of Trepaxonemata, attachment zones, a nucleus, cortical microtubules (CMs), electron-dense granules, and a single crested body. Structural polymorphism of the CBs has been found within the two Eubothrium species for the first time. The anterior ring of electron-dense tubular structures surrounding a single axoneme marks the border between the two defined regions, region I and region II of the spermatozoon. This unique feature has only been observed in the Bothriocephalidea. The anuclear axoneme region II of Eubothrium spermatozoa fluently verges into a nuclear region III. The posterior part of the spermatozoon contains one-axoneme, few CMs and a posterior extremity of the nucleus that subsequently disappears. The posterior extremity of the male gametes of the genus Eubothrium exhibits elements of a disorganized axoneme which characterize also spermatozoa of the family Triaenophoridae. Discussed are interspecific similarities and differences between the spermatozoa of the two Eubothrium species as well as between these and other Eucestoda.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrastructure of the mature spermatozoon of Eubothrium rugosum (Batsch, 1786) with a re-assessment of the spermatozoon ultrastructure of Eubothrium crassum (Bloch, 1779) (Cestoda: Bothriocephalidea)

et al. 2010

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“…This character is variable within the "Pseudophyllidea" and the number of plates varies from one to five within the group. It is formed by a single electron-dense layer in both B. scorpii and E. crassum (Bruňanská et al 2001; Levron et al 2006b), by three layers in P. gracilis, T. nodulosus and D. latum (Levron et al 2005(Levron et al , 2006cŠípková et al 2010) as occurs in C. crassiceps, and by five layers in L.…”

Section: Spermiogenesismentioning

confidence: 99%

“…In Triaenophorus nodulosus, Bothriocephalus scorpii and Eubothrium rugosum this ring of cortical microtubules participates in the formation of the crested body (Levron et al 2005(Levron et al , 2006b). On the other hand, the first type of cortical microtubules generally stays in the first region of the spermatozoon, but in B. claviceps ) some electron-dense microtubules were found in the posterior areas of the sperm cell.…”

Section: Eliminado: Appearsmentioning

confidence: 99%

“…Concerning the bothriocephalideans the analysed species are the bothriocephalids Bothriocephalus clavibothrium, Bothriocephalus claviceps, Bothriocephalus scorpii, Oncodiscus sauridae and Senga sp. (Świderski and Mokhtar-Maamouri 1980;Levron et al 2006b;Bâ et al 2007;Šípková et al 2011), the echinophallids Parabothriocephalus gracilis and Paraechinophallus japonicus (Levron et al 2006a;Šípková et al 2010), and the triaenophorids Eubothrium crassum, Eubothrium rugosum and Triaenophorus nodulosus (Bruňanská et al 2001(Bruňanská et al , 2002Levron et al 2005). In what refers the diphyllobothriideans, the three studied species are the scyphocephalid Duthiersia fimbriata (Justine 1986), and the diphyllobothriids Diphyllobothrium latum and Ligula intestinalis (Levron et al 2006c(Levron et al , 2009).…”

Section: Introductionmentioning

confidence: 99%

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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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Spermatological characters inDiphyllobothrium latum (Cestoda, Pseudophyllidea)

2006

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Spermiogenesis and the ultrastructural features of the spermatozoon of Diphyllobothrium latum (Cestoda, Pseudophyllidea) are described using transmission electron microscopy. Spermiogenesis is characterized by the development of two flagella of unequal length that grow asynchronously. When the first growing flagellum starts to rotate, the second one develops. Flagellar rotation is thus asymmetric and asynchronic. It is followed by proximodistal fusion with the median cytoplasmic process. Electron-dense material is present in the apical region of the zone of differentiation in the early stages of spermiogenesis. The intercentriolar body consists of seven plates: three are electron-dense. Four attachment zones occur in the median cytoplasmic process. An atypical arrangement of striated roots was occasionally observed. The mature spermatozoon possesses two axonemes of 9 + "1" trepaxonematan pattern, nucleus, cortical microtubules, electron-dense granules, and lacks mitochondria. The ultrastructure of the anterior extremity of the spermatozoon in D. latum clearly differs from that in the bothriocephalid pseudophyllideans, mainly in the absence of a crested body and a ring of electron-dense tubular structures. The spermatological data support the assumption that the order Pseudophyllidea is formed by two unrelated clades, "Bothriocephalidea" and "Diphyllobothriidea."

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Spermatological characters of the pseudophyllidean cestode Bothriocephalus scorpii (Müller, 1776)

Cited by 37 publications

References 31 publications

Ultrastructure of the mature spermatozoon of Eubothrium rugosum (Batsch, 1786) with a re-assessment of the spermatozoon ultrastructure of Eubothrium crassum (Bloch, 1779) (Cestoda: Bothriocephalidea)

Ultrastructure of the mature spermatozoon of Eubothrium rugosum (Batsch, 1786) with a re-assessment of the spermatozoon ultrastructure of Eubothrium crassum (Bloch, 1779) (Cestoda: Bothriocephalidea)

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

Spermatological characters inDiphyllobothrium latum (Cestoda, Pseudophyllidea)

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