Spermatozoon

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Bernard Marchand - One of the best experts on this subject based on the ideXlab platform.

  • Ultrastructure of the Spermatozoon of Lecithostaphylus parexocoeti (Digenea, Microphalloidea, Zoogonidae) parasite of the flying fish Cheilopogon pinnatibarbatus (Teleostei, Exocoetidae) off Senegal and their implication on the phylogenetic relations
    Zoomorphology, 2020
    Co-Authors: Aïssatou Bâ, Abdoulaye J. S. Bakhoum, Papa Ibnou Ndiaye, Cheikh Tidiane Ba, Rodney A. Bray, Bernard Marchand, Yann Quilichini
    Abstract:

    This study shows the ultrastructure of the mature Spermatozoon of Lecithostaphylus parexocoeti (Digenea, Microphalloidea, Zoogonidae) parasite of the flying fish Cheilopogon pinnatibarbatus (Exocoetidae) captured in the Atlantic Ocean near Dakar (Senegal). This is the first report of L. parexocoeti from Senegal and from this host species. The mature Spermatozoon is filiform and exhibits two axonemes of the 9+“1” pattern of the Trepaxonemata, an external ornamentation associated with spine-like bodies, parallel cortical microtubules, a nucleus, two mitochondria and granules of glycogen. The particularities of the Spermatozoon of L. parexocoeti are the location of the first mitochondrion and the morphology of its anterior extremity with only cortical microtubules and external ornamentations of the plasma membrane. To our knowledge, this type of anterior extremity has never been described in the superfamily Microphalloidea. However, the ultrastructure of the posterior extremity of the Spermatozoon corresponds to the fasciolidean type that was previously described in the Zoogonidae.

  • ultrastructure of the Spermatozoon of aephnidiogenes senegalensis digenea aephnidiogenidae an intestinal parasite of pomadasys jubelini teleostei haemulidae off the coast of dakar senegal
    Zoologischer Anzeiger, 2018
    Co-Authors: Aïssatou Bâ, Abdoulaye J. S. Bakhoum, P Ndiaye, Cheikh Tidiane Ba, Rodney A. Bray, Bernard Marchand, Yann Quilichini
    Abstract:

    Abstract This study provides the first ultrastructural data on the mature Spermatozoon of Aephnidiogenes senegalensis (Digenea, Lepocreadioidea, Aephnidiogenidae) parasite of the teleost fish Pomadasys jubelini (Haemulidae) captured near the coast of Dakar (Senegal). This is also the first ultrastructural data on the Spermatozoon in the genus Aephnidiogenes. The mature Spermatozoon of A. senegalensis is filiform, tapered at both ends and exhibits the general pattern described in the Lepocreadioidea, namely two axonemes of the 9 + ‘1’ pattern, an antero-lateral electron dense material, a nucleus, two mitochondria, external ornamentation of the plasma membrane in the anterior region of the Spermatozoon, granules of glycogen and two bundles of parallel cortical microtubules. A peculiarity of the Spermatozoon of A. senegalensis is the structure of the apical electron-dense material.

  • ultrastructural characteristics of the mature Spermatozoon of the digenean sclerodistomum italicum stossich 1893 hemiuroidea sclerodistomidae intestinal parasite of hypocanthus amia teleostei carangidae
    Tissue & Cell, 2017
    Co-Authors: P Ndiaye, Cheikh Tidiane Ba, Yann Quilichini, Vasyl V Tkach, Adji Mama Marigo, Bernard Marchand
    Abstract:

    Abstract The mature Spermatozoon of Sclerodistomum italicum is filiform, tapered at both ends and shows the following features: 2 axonemes of the 9 + “1” pattern of the Trepaxonemata, mitochondrion, nucleus and parallel cortical microtubules. The specific features of the Spermatozoon of S. italicum include the simultaneous presence of two types of extramembranous ornamentations, the presence of short cortical microtubules in the anterior part of the Spermatozoon and the presence of only one bundle of cortical microtubules in the median part of the Spermatozoon. Thus far these structures are known only in the Hemiuroidea. The presence of filamentous ornamentation in the anterior extremity of the Spermatozoon has not previously been described in the Sclerodistomidae. Similar to spermatozoa of other hemiuroideans, S. italicum lack spine-like bodies described in spermatozoa of many digenean taxa. The posterior extremity of the Spermatozoon exhibits the same ultrastructural characteristics typical of the Hemiuroidea.

  • Spermatozoon ultrastructure in two monorchiid digeneans
    PeerJ, 2016
    Co-Authors: Yann Quilichini, Abdoulaye J. S. Bakhoum, Cheikh Tidiane Ba, Jeanlou Justine, Rodney A Bray, Bernard Marchand
    Abstract:

    Spermatological characteristics of species from two monorchiid genera, Opisthomonorchis and Paramonorcheides, have been investigated, for the first time, by means of transmission electron microscopy. The ultrastructural study reveals that the mature Spermatozoon of Opisthomonorchis dinema and Paramonorcheides selaris share several characters such as the presence of two axonemes of different lengths showing the 9+''1'' pattern of the Trepaxonemata, a nucleus, two mitochondria, two bundles of parallel cortical microtubules, external ornamentation of the plasma membrane, spine-like bodies, granules of glycogen and similar morphologies of the anterior and posterior extremities. The slight differences between the male gamete of O. dinema and P. selaris are the length of the first axoneme and the position of the second mitochondrion. This study also elucidates the general morphology of the Spermatozoon in all monorchiid species described so far, which corresponds to a unique Spermatozoon type. Other interesting finds concern the spermatological similarities between monorchiid spermatozoa and the mature Spermatozoon reported in the apocreadiid Neoapocreadium chabaudi. These similarities allow us to suggest a close phylogenetical relationship between the Monorchiidae and the Apocreadiidae, although more studies are needed, especially in the unexplored taxa.

  • ultrastructural study of the Spermatozoon of hemiurus appendiculatus digenea hemiuroidea hemiuridae a parasite of boops boops pisces teleostei sparidae off senegal
    Tissue & Cell, 2016
    Co-Authors: Ayatoulaye Dione, P Ndiaye, Cheikh Tidiane Ba, Yann Quilichini, Papa Mbagnick Diagne, Bernard Marchand
    Abstract:

    The mature Spermatozoon of Hemiurus appendiculatus exhibits the general pattern described in most of the digenean namely, two axonemes of the 9 + "1" pattern of the Trepaxonemata, a nucleus, a filiform mitochondrion, external ornamentations of the plasma membrane and parallel cortical microtubules located on one side of the Spermatozoon. In this study, we show for the second time in a digenean Spermatozoon the presence of microtubules of the second axoneme associated each in a short length with an external ornamentation, seven cortical microtubules, a terminal bulge in the anterior Spermatozoon extremity separate from the remainder of the Spermatozoon by a transverse constriction and the simultaneous presence of the external ornamentation of the plasma membrane with a filamentous ornamentation. The external ornamentations have a differentiated distribution, cover almost the anterior region of the Spermatozoon, are more abundant around the first axoneme and extend backwards over a short distance around the second axoneme. This study also allowed us to reveal for the first time the existence in the Hemiuroidea of an axoneme that begins to disrupt before reaching the front end of the mitochondrion.

Yann Quilichini - One of the best experts on this subject based on the ideXlab platform.

  • Ultrastructure of the Spermatozoon of Lecithostaphylus parexocoeti (Digenea, Microphalloidea, Zoogonidae) parasite of the flying fish Cheilopogon pinnatibarbatus (Teleostei, Exocoetidae) off Senegal and their implication on the phylogenetic relations
    Zoomorphology, 2020
    Co-Authors: Aïssatou Bâ, Abdoulaye J. S. Bakhoum, Papa Ibnou Ndiaye, Cheikh Tidiane Ba, Rodney A. Bray, Bernard Marchand, Yann Quilichini
    Abstract:

    This study shows the ultrastructure of the mature Spermatozoon of Lecithostaphylus parexocoeti (Digenea, Microphalloidea, Zoogonidae) parasite of the flying fish Cheilopogon pinnatibarbatus (Exocoetidae) captured in the Atlantic Ocean near Dakar (Senegal). This is the first report of L. parexocoeti from Senegal and from this host species. The mature Spermatozoon is filiform and exhibits two axonemes of the 9+“1” pattern of the Trepaxonemata, an external ornamentation associated with spine-like bodies, parallel cortical microtubules, a nucleus, two mitochondria and granules of glycogen. The particularities of the Spermatozoon of L. parexocoeti are the location of the first mitochondrion and the morphology of its anterior extremity with only cortical microtubules and external ornamentations of the plasma membrane. To our knowledge, this type of anterior extremity has never been described in the superfamily Microphalloidea. However, the ultrastructure of the posterior extremity of the Spermatozoon corresponds to the fasciolidean type that was previously described in the Zoogonidae.

  • ultrastructure of the Spermatozoon of aephnidiogenes senegalensis digenea aephnidiogenidae an intestinal parasite of pomadasys jubelini teleostei haemulidae off the coast of dakar senegal
    Zoologischer Anzeiger, 2018
    Co-Authors: Aïssatou Bâ, Abdoulaye J. S. Bakhoum, P Ndiaye, Cheikh Tidiane Ba, Rodney A. Bray, Bernard Marchand, Yann Quilichini
    Abstract:

    Abstract This study provides the first ultrastructural data on the mature Spermatozoon of Aephnidiogenes senegalensis (Digenea, Lepocreadioidea, Aephnidiogenidae) parasite of the teleost fish Pomadasys jubelini (Haemulidae) captured near the coast of Dakar (Senegal). This is also the first ultrastructural data on the Spermatozoon in the genus Aephnidiogenes. The mature Spermatozoon of A. senegalensis is filiform, tapered at both ends and exhibits the general pattern described in the Lepocreadioidea, namely two axonemes of the 9 + ‘1’ pattern, an antero-lateral electron dense material, a nucleus, two mitochondria, external ornamentation of the plasma membrane in the anterior region of the Spermatozoon, granules of glycogen and two bundles of parallel cortical microtubules. A peculiarity of the Spermatozoon of A. senegalensis is the structure of the apical electron-dense material.

  • ultrastructural characteristics of the mature Spermatozoon of the digenean sclerodistomum italicum stossich 1893 hemiuroidea sclerodistomidae intestinal parasite of hypocanthus amia teleostei carangidae
    Tissue & Cell, 2017
    Co-Authors: P Ndiaye, Cheikh Tidiane Ba, Yann Quilichini, Vasyl V Tkach, Adji Mama Marigo, Bernard Marchand
    Abstract:

    Abstract The mature Spermatozoon of Sclerodistomum italicum is filiform, tapered at both ends and shows the following features: 2 axonemes of the 9 + “1” pattern of the Trepaxonemata, mitochondrion, nucleus and parallel cortical microtubules. The specific features of the Spermatozoon of S. italicum include the simultaneous presence of two types of extramembranous ornamentations, the presence of short cortical microtubules in the anterior part of the Spermatozoon and the presence of only one bundle of cortical microtubules in the median part of the Spermatozoon. Thus far these structures are known only in the Hemiuroidea. The presence of filamentous ornamentation in the anterior extremity of the Spermatozoon has not previously been described in the Sclerodistomidae. Similar to spermatozoa of other hemiuroideans, S. italicum lack spine-like bodies described in spermatozoa of many digenean taxa. The posterior extremity of the Spermatozoon exhibits the same ultrastructural characteristics typical of the Hemiuroidea.

  • Spermatozoon ultrastructure in two monorchiid digeneans
    PeerJ, 2016
    Co-Authors: Yann Quilichini, Abdoulaye J. S. Bakhoum, Cheikh Tidiane Ba, Jeanlou Justine, Rodney A Bray, Bernard Marchand
    Abstract:

    Spermatological characteristics of species from two monorchiid genera, Opisthomonorchis and Paramonorcheides, have been investigated, for the first time, by means of transmission electron microscopy. The ultrastructural study reveals that the mature Spermatozoon of Opisthomonorchis dinema and Paramonorcheides selaris share several characters such as the presence of two axonemes of different lengths showing the 9+''1'' pattern of the Trepaxonemata, a nucleus, two mitochondria, two bundles of parallel cortical microtubules, external ornamentation of the plasma membrane, spine-like bodies, granules of glycogen and similar morphologies of the anterior and posterior extremities. The slight differences between the male gamete of O. dinema and P. selaris are the length of the first axoneme and the position of the second mitochondrion. This study also elucidates the general morphology of the Spermatozoon in all monorchiid species described so far, which corresponds to a unique Spermatozoon type. Other interesting finds concern the spermatological similarities between monorchiid spermatozoa and the mature Spermatozoon reported in the apocreadiid Neoapocreadium chabaudi. These similarities allow us to suggest a close phylogenetical relationship between the Monorchiidae and the Apocreadiidae, although more studies are needed, especially in the unexplored taxa.

  • ultrastructural study of the Spermatozoon of hemiurus appendiculatus digenea hemiuroidea hemiuridae a parasite of boops boops pisces teleostei sparidae off senegal
    Tissue & Cell, 2016
    Co-Authors: Ayatoulaye Dione, P Ndiaye, Cheikh Tidiane Ba, Yann Quilichini, Papa Mbagnick Diagne, Bernard Marchand
    Abstract:

    The mature Spermatozoon of Hemiurus appendiculatus exhibits the general pattern described in most of the digenean namely, two axonemes of the 9 + "1" pattern of the Trepaxonemata, a nucleus, a filiform mitochondrion, external ornamentations of the plasma membrane and parallel cortical microtubules located on one side of the Spermatozoon. In this study, we show for the second time in a digenean Spermatozoon the presence of microtubules of the second axoneme associated each in a short length with an external ornamentation, seven cortical microtubules, a terminal bulge in the anterior Spermatozoon extremity separate from the remainder of the Spermatozoon by a transverse constriction and the simultaneous presence of the external ornamentation of the plasma membrane with a filamentous ornamentation. The external ornamentations have a differentiated distribution, cover almost the anterior region of the Spermatozoon, are more abundant around the first axoneme and extend backwards over a short distance around the second axoneme. This study also allowed us to reveal for the first time the existence in the Hemiuroidea of an axoneme that begins to disrupt before reaching the front end of the mitochondrion.

Jordi Miquel - One of the best experts on this subject based on the ideXlab platform.

  • ultrastructural organisation of the Spermatozoon of allopodocotyle tunisiensis derbel and neifar 2009 digenea opecoelidae an intestinal parasite of solea aegyptiaca chabanaud 1927 teleostei soleidae
    Tissue & Cell, 2019
    Co-Authors: Hichem Kacem, Papa Mbagnick Diagne, Jordi Miquel
    Abstract:

    Abstract The ultrastructure of the Spermatozoon of Allopodocotyle tunisiensis (Digenea, Opecoelidae), an intestinal parasite of Solea aegyptiaca (Teleostei, Soleidae), is described by transmission electron microscopy (TEM). The mature Spermatozoon is a filiform cell that exhibits two axonemes of different length with the 9+'1' pattern of trepaxonematan Platyhelminthes. In the anterior Spermatozoon extremity, cortical microtubules are absent. They appear after the disappearance of an anterior electron-dense material, being initially in a continuous and submembranous layer. They surround only partially the sperm cell. Later, these cortical microtubules are distributed into two bundles. Additionally, the Spermatozoon of A. tunisiensis shows two mitochondria, a nucleus, an external ornamentation of the plasma membrane, spine-like bodies, and a large amount of glycogen granules. According to the location of the external ornamentation, A. tunisiensis presents a Quilichini et al.'s type 2 Spermatozoon. With respect to the posterior extremity, the sperm cell of A. tunisiensis corresponds to the Quilichini et al.'s opecoelid type. The morphology of the first mitochondrion with a U-shaped posterior extremity is described for the first time in a digenean Spermatozoon.

  • Ultrastructural characters of the Spermatozoon of the liver fluke Opisthorchis viverrini (Poirier, 1886) (Opisthorchiidae)
    Parasitology Research, 2017
    Co-Authors: Jordi Miquel, Zdzisław Świderski, Banchob Sripa, Alexis Ribas
    Abstract:

    The present study records the ultrastructural organization of the mature Spermatozoon of Opisthorchis viverrini by means of transmission electron microscopy. The Spermatozoon of O. viverrini is a filiform cell, tapered at both extremities. It exhibits the characteristics of type IV Spermatozoon of digeneans, namely with two axonemes of the 9+‘1’ trepaxonematan pattern, external ornamentation of the plasma membrane associated with cortical microtubules that are in the posterior part of the anterior region of the sperm cell, and with two mitochondria. The maximal number of cortical microtubules is in the anterior part of the Spermatozoon and arranged into two bundles. Other characteristics are spine-like bodies and a posterior extremity with only the second axoneme. Ultrastructural characters of the Spermatozoon of O. viverrini are compared with those of other known digeneans belonging to the Opisthorchioidea, with particular emphasis on representatives of the family Opisthorchiidae. The main differences between O. viverrini and its congener Opisthorchis felineus are the spine-like bodies (present and absent, respectively) and the posterior Spermatozoon character (axoneme and nucleus, respectively).

  • the opecoelidae sperm model and its contribution to phylogeny Spermatozoon ultrastructural particularities of allopodocotyle pedicellata plagioporinae digenea platyhelminthes
    Zoologischer Anzeiger, 2017
    Co-Authors: Abdoulaye J. S. Bakhoum, Hichem Kacem, Lassad Neifar, Jordi Miquel
    Abstract:

    The ultrastructure of the Spermatozoon of Allopodocotyle pedicellata (Digenea, Opecoelidae), an intestinal parasite of the teleost Sparus aurata (gilt-head bream), is described by means of transmission electron microscopy (TEM). The mature Spermatozoon possesses two axonemes of the 9+“1” trepaxonematan pattern, an anterior electron-dense material, two mitochondria, a nucleus, external ornamentation of the plasma membrane, spine-like bodies and parallel cortical microtubules distributed into two bundles. The anterior electron-dense material and the morphology of the anterior mitochondrion are the noteworthy characters that distinguish the Spermatozoon of A. pedicellata from those of most opecoelids. However, a comparative study with the remaining opecoelids described so far, reveals similarities in their ultrastructural organization. Thus, the sperm model is established for the Opecoelidae and it is compared to mature spermatozoa of other digeneans, particularly those belonging to the family Opistholebetidae and the superfamilies Allocreadioidea and Brachycladioidea or their related sister groups. The morphology of the posterior Spermatozoon extremity, the disposition of cortical microtubules and the association of external ornamentation with cortical microtubules and spine-like bodies appear as interesting elements with phylogenetic significance for the Opecoelidae.

  • ultrastructure of the Spermatozoon of the digenean tergestia acanthocephala stossich 1887 gymnophalloidea fellodistomidae an intestinal parasite of belone belone gracilis pisces teleostei
    Tissue & Cell, 2015
    Co-Authors: Hichem Kacem, P Ndiaye, Jordi Torres, Lassad Neifar, Jordi Miquel
    Abstract:

    The ultrastructural organization of the Spermatozoon of the digenean Tergestia acanthocephala (Gymnophalloidea: Fellodistomidae) is described. Live digeneans were collected from Belone belone gracilis (Teleostei: Belonidae), caught off the Gulf of Gabes in Chebba (Tunisia). The mature Spermatozoon of T. acanthocephala exhibits the general pattern described in numerous digeneans, characterized by the presence of two axonemes of the different length of the 9+'1' pattern of the Trepaxonemata, a nucleus, two mitochondria, two bundles of parallel cortical microtubules, external ornamentation, spine-like bodies and granules of glycogen. Moreover, the morphology of the posterior Spermatozoon extremity in T. acanthocephala corresponds to the fasciolidean type of Quilichini et al. (2010a).

  • the ultrastructural characters of the mature Spermatozoon of opechona bacillaris molin 1859 digenea lepocreadiidae a parasite of scomber colias gmelin 1789 scombridae off the coast of dakar senegal
    Acta Zoologica, 2015
    Co-Authors: P Ndiaye, Abdoulaye J. S. Bakhoum, Aminata Sene, Papa Mbagnick Diagne, Jordi Miquel
    Abstract:

    This study presents the ultrastructure of the mature Spermatozoon of Opechona bacillaris, a digenean belonging to the family Lepocreadiidae. The sperm cell of O. bacillaris exhibits the general pattern described in most of the Lepocreadioidea: two axonemes of the 9 + ‘1’ pattern of the Trepaxonemata, mitochondria, a cortical mitochondrion, a nucleus, electron-dense material in the anterior extremity of the Spermatozoon, external ornamentation of the plasma membrane with associated spinelike bodies, and granules of glycogen. However, particularities of O. bacillaris are the simultaneous presence in the anterior extremity of the Spermatozoon of the electron-dense material, a mitochondrion, and the absence of cortical microtubules. In the Lepocreadiidae, we describe for the first time in O. bacillaris spinelike bodies associated with the external ornamentation of the plasma membrane and two mitochondria. The first mitochondrion is moniliform and composed of a mitochondrial cord with joined mitochondrial bulges. The second mitochondrion shows a regular form. The posterior tip of the Spermatozoon has only singlets to owing to the disorganization of the second axoneme and granules of glycogen as occurs in Hypocreadium caputvadum, the other studied species of the family Lepocreadiidae.

Josephine Foata - One of the best experts on this subject based on the ideXlab platform.

  • Spermatozoon ultrastructure of gyliauchen sp digenea gyliauchenidae an intestinal parasite of siganus fuscescens pisces teleostei
    The Biological Bulletin, 2011
    Co-Authors: Yann Quilichini, Josephine Foata, Jeanlou Justine, Rodney A Bray, Bernard Marchand
    Abstract:

    The ultrastructure of the mature Spermatozoon of Gyliauchen sp., a parasite of the dusky rabbitfish Siganus fuscescens, was studied by transmission electron microscopy. The Spermatozoon possesses two axonemes of the 9+“1” pattern of Trepaxonemata, four attachment zones, one mitochondrion, a nucleus, cortical microtubules, external ornamentation of the plasma membrane, and spine-like bodies. The main characteristics of this Spermatozoon are the presence of one mitochondrion, spine-like bodies not associated with the external ornamentation, and a posterior extremity of type 3 that is characterized by the following sequence: posterior extremity of the nucleus then posterior extremity of the second axoneme. Numerous other ultrastructural features are also discussed and compared to the digenean spermatology literature. This is the first study of a member of the Gyliauchenidae and the fourth within the Lepocreadioidea. The results show that many ultrastructural characters are variable within this superfamily an...

  • ultrastructural study of the Spermatozoon of heterolebes maculosus digenea opistholebetidae a parasite of the porcupinefish diodon hystrix pisces teleostei
    Parasitology International, 2010
    Co-Authors: Yann Quilichini, Josephine Foata, Jeanlou Justine, Rodney A Bray, Bernard Marchand
    Abstract:

    This paper describes the ultrastructure of the mature Spermatozoon of Heterolebes maculosus. It is the first study of this kind concerning the Opistholebetidae (Platyhelminthes, Digenea). The ultrastructural elements observed in the Spermatozoon are: two axonemes with 9+"1" pattern of Trepaxonemata and their attachment zones, two mitochondria, a nucleus, cortical microtubules, external ornamentation of the plasma membrane and spine-like bodies. The number and the disposition of cortical microtubules, the organisation of 11 cortical microtubules disposed in semi-circle around the first mitochondrion in the external ornamentation region and the organisation of the posterior part of the Spermatozoon are discussed. Three principal types of posterior part of digenean spermatozoa are proposed. The similarity between the Spermatozoon of the Opistholebetidae H. maculosus and Opecoelidae enables us to confirm that these two families are closely related.

  • Spermatozoon ultrastructure of aponurus laguncula digenea lecithasteridae a parasite of aluterus monoceros pisces teleostei
    Parasitology International, 2010
    Co-Authors: Yann Quilichini, Josephine Foata, Jeanlou Justine, Rodney A Bray, Bernard Marchand
    Abstract:

    The mature Spermatozoon of Aponurus laguncula, a parasite of the unicorn leatherjacket Aluterus monoceros, was studied by transmission electron microscopy. The Spermatozoon possesses 2 axonemes of the 9+"1" trepaxonematan pattern, attachment zones, a nucleus, a mitochondrion, external ornamentation of the plasma membrane and cortical microtubules. The major features are the presence of: 1) external ornamentation in the anterior part of the Spermatozoon not associated with cortical microtubules; 2) one mitochondrion; and 3) cortical microtubules arranged as a single field in the ventral side. The maximum number of microtubules is in the nuclear region. The extremities of the axonemes are characterized by the disappearance of the central core and the presence of microtubule doublets or singlets. This study is the first undertaken with a member of the Lecithasteridae and exemplifies the sperm ultrastructure for the superfamily Hemiuroidea.

  • Spermiogenesis and sperm ultrastructure of Deropristis Inflata Molin, 1859 (Digenea, Deropristidae), a parasite of Anguilla anguilla
    Parasitology Research, 2007
    Co-Authors: Josephine Foata, Yann Quilichini, Bernard Marchand
    Abstract:

    To our knowledge, this paper describes the first ultrastructural results on spermiogenesis and the Spermatozoon of a Digenea belonging to the family Deropristidae, Deropristis inflata . Spermiogenesis follows the usual pattern found in the digeneans, but a single noteworthy characteristic concerns the centriole, which presents a “prominent pear-shaped electron-dense region.” Spermiogenesis in D. inflata begins with the formation of a differentiation zone. The two centrioles give rise to flagella. These two flagella undergo a rotation of 90° and fuse with the median cytoplasmic process. The proximo-distal fusion occurs at the level of attachment zones. The mature Spermatozoon of D. inflata possesses five regions and presents all the features found in the digenean gamete. However, several characteristics allow us to distinguish the Spermatozoon of D. inflata from other digenetic trematoda, namely the external ornamentations of the plasmic membrane, the anterior and posterior extremities. Furthermore, the distal part of the nucleus in front of those of the mitochondria appears such a distinctive criterion in the Spermatozoon of this species. Our ultrastructural investigations produce new data on the reproduction of D. inflata , which may be useful for the understanding of the phylogenetic relationships in the Deropristidae family.

  • ultrastructural study of the Spermatozoon of nicolla testiobliquum digenea opecoelidae parasite of brown trout salmo trutta pisces teleostei
    Parasitology Research, 2007
    Co-Authors: Yann Quilichini, Josephine Foata, Bernard Marchand
    Abstract:

    The present paper describes the Spermatozoon of Nicolla testiobliquum (Digenea, Opecoelidae), an intestinal parasite of brown trout Salmo trutta, studied by transmission electron microscopy. The mature Spermatozoon possess two axonemes of 9 + “1” pattern, two mitochondria, a nucleus, external ornamentation of the plasma membrane, spine-like bodies and cortical microtubules. A comparative study between N. testiobliquum and Nicolla wisniewskii shows mainly two different dispositions of the two mitochondria in these two species of a same genera. Moreover, the comparison of each of these Spermatozoon features with others digeneans, in general, and other Opecoelidae in particular, is also presented. It appears that the organisation of the posterior part of the Spermatozoon, the disposition of cortical microtubules and external ornamentation associated with spine-like bodies could be interesting elements for phylogeny.

Cheikh Tidiane Ba - One of the best experts on this subject based on the ideXlab platform.

  • Ultrastructure of the Spermatozoon of Lecithostaphylus parexocoeti (Digenea, Microphalloidea, Zoogonidae) parasite of the flying fish Cheilopogon pinnatibarbatus (Teleostei, Exocoetidae) off Senegal and their implication on the phylogenetic relations
    Zoomorphology, 2020
    Co-Authors: Aïssatou Bâ, Abdoulaye J. S. Bakhoum, Papa Ibnou Ndiaye, Cheikh Tidiane Ba, Rodney A. Bray, Bernard Marchand, Yann Quilichini
    Abstract:

    This study shows the ultrastructure of the mature Spermatozoon of Lecithostaphylus parexocoeti (Digenea, Microphalloidea, Zoogonidae) parasite of the flying fish Cheilopogon pinnatibarbatus (Exocoetidae) captured in the Atlantic Ocean near Dakar (Senegal). This is the first report of L. parexocoeti from Senegal and from this host species. The mature Spermatozoon is filiform and exhibits two axonemes of the 9+“1” pattern of the Trepaxonemata, an external ornamentation associated with spine-like bodies, parallel cortical microtubules, a nucleus, two mitochondria and granules of glycogen. The particularities of the Spermatozoon of L. parexocoeti are the location of the first mitochondrion and the morphology of its anterior extremity with only cortical microtubules and external ornamentations of the plasma membrane. To our knowledge, this type of anterior extremity has never been described in the superfamily Microphalloidea. However, the ultrastructure of the posterior extremity of the Spermatozoon corresponds to the fasciolidean type that was previously described in the Zoogonidae.

  • ultrastructure of the Spermatozoon of aephnidiogenes senegalensis digenea aephnidiogenidae an intestinal parasite of pomadasys jubelini teleostei haemulidae off the coast of dakar senegal
    Zoologischer Anzeiger, 2018
    Co-Authors: Aïssatou Bâ, Abdoulaye J. S. Bakhoum, P Ndiaye, Cheikh Tidiane Ba, Rodney A. Bray, Bernard Marchand, Yann Quilichini
    Abstract:

    Abstract This study provides the first ultrastructural data on the mature Spermatozoon of Aephnidiogenes senegalensis (Digenea, Lepocreadioidea, Aephnidiogenidae) parasite of the teleost fish Pomadasys jubelini (Haemulidae) captured near the coast of Dakar (Senegal). This is also the first ultrastructural data on the Spermatozoon in the genus Aephnidiogenes. The mature Spermatozoon of A. senegalensis is filiform, tapered at both ends and exhibits the general pattern described in the Lepocreadioidea, namely two axonemes of the 9 + ‘1’ pattern, an antero-lateral electron dense material, a nucleus, two mitochondria, external ornamentation of the plasma membrane in the anterior region of the Spermatozoon, granules of glycogen and two bundles of parallel cortical microtubules. A peculiarity of the Spermatozoon of A. senegalensis is the structure of the apical electron-dense material.

  • ultrastructural characteristics of the mature Spermatozoon of the digenean sclerodistomum italicum stossich 1893 hemiuroidea sclerodistomidae intestinal parasite of hypocanthus amia teleostei carangidae
    Tissue & Cell, 2017
    Co-Authors: P Ndiaye, Cheikh Tidiane Ba, Yann Quilichini, Vasyl V Tkach, Adji Mama Marigo, Bernard Marchand
    Abstract:

    Abstract The mature Spermatozoon of Sclerodistomum italicum is filiform, tapered at both ends and shows the following features: 2 axonemes of the 9 + “1” pattern of the Trepaxonemata, mitochondrion, nucleus and parallel cortical microtubules. The specific features of the Spermatozoon of S. italicum include the simultaneous presence of two types of extramembranous ornamentations, the presence of short cortical microtubules in the anterior part of the Spermatozoon and the presence of only one bundle of cortical microtubules in the median part of the Spermatozoon. Thus far these structures are known only in the Hemiuroidea. The presence of filamentous ornamentation in the anterior extremity of the Spermatozoon has not previously been described in the Sclerodistomidae. Similar to spermatozoa of other hemiuroideans, S. italicum lack spine-like bodies described in spermatozoa of many digenean taxa. The posterior extremity of the Spermatozoon exhibits the same ultrastructural characteristics typical of the Hemiuroidea.

  • Spermatozoon ultrastructure in two monorchiid digeneans
    PeerJ, 2016
    Co-Authors: Yann Quilichini, Abdoulaye J. S. Bakhoum, Cheikh Tidiane Ba, Jeanlou Justine, Rodney A Bray, Bernard Marchand
    Abstract:

    Spermatological characteristics of species from two monorchiid genera, Opisthomonorchis and Paramonorcheides, have been investigated, for the first time, by means of transmission electron microscopy. The ultrastructural study reveals that the mature Spermatozoon of Opisthomonorchis dinema and Paramonorcheides selaris share several characters such as the presence of two axonemes of different lengths showing the 9+''1'' pattern of the Trepaxonemata, a nucleus, two mitochondria, two bundles of parallel cortical microtubules, external ornamentation of the plasma membrane, spine-like bodies, granules of glycogen and similar morphologies of the anterior and posterior extremities. The slight differences between the male gamete of O. dinema and P. selaris are the length of the first axoneme and the position of the second mitochondrion. This study also elucidates the general morphology of the Spermatozoon in all monorchiid species described so far, which corresponds to a unique Spermatozoon type. Other interesting finds concern the spermatological similarities between monorchiid spermatozoa and the mature Spermatozoon reported in the apocreadiid Neoapocreadium chabaudi. These similarities allow us to suggest a close phylogenetical relationship between the Monorchiidae and the Apocreadiidae, although more studies are needed, especially in the unexplored taxa.

  • ultrastructural study of the Spermatozoon of hemiurus appendiculatus digenea hemiuroidea hemiuridae a parasite of boops boops pisces teleostei sparidae off senegal
    Tissue & Cell, 2016
    Co-Authors: Ayatoulaye Dione, P Ndiaye, Cheikh Tidiane Ba, Yann Quilichini, Papa Mbagnick Diagne, Bernard Marchand
    Abstract:

    The mature Spermatozoon of Hemiurus appendiculatus exhibits the general pattern described in most of the digenean namely, two axonemes of the 9 + "1" pattern of the Trepaxonemata, a nucleus, a filiform mitochondrion, external ornamentations of the plasma membrane and parallel cortical microtubules located on one side of the Spermatozoon. In this study, we show for the second time in a digenean Spermatozoon the presence of microtubules of the second axoneme associated each in a short length with an external ornamentation, seven cortical microtubules, a terminal bulge in the anterior Spermatozoon extremity separate from the remainder of the Spermatozoon by a transverse constriction and the simultaneous presence of the external ornamentation of the plasma membrane with a filamentous ornamentation. The external ornamentations have a differentiated distribution, cover almost the anterior region of the Spermatozoon, are more abundant around the first axoneme and extend backwards over a short distance around the second axoneme. This study also allowed us to reveal for the first time the existence in the Hemiuroidea of an axoneme that begins to disrupt before reaching the front end of the mitochondrion.

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