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Acta Parasitologica

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Volume 62, Issue 3 (Sep 2017)

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Ultrastructure of the spermatozoon of Macvicaria obovata (Digenea: Opecoelidae), a parasite of Sparus aurata(Pisces: Teleostei) from the Gulf of Gabès, Mediterranean Sea

Hichem Kacem
  • Corresponding author
  • Laboratoire de Biodiversité et Ecosystèmes Aquatiques, Département des Sciences de la Vie, Faculté des Sciences de Sfax, BP 1171, 3000 Sfax, Tunisia
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Yann Quilichini
  • CNRS UMR 6134, University of Corsica, Laboratory “Parasites and Mediterranean Ecosystems”, 20250 Corte, Corsica, France
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  • De Gruyter OnlineGoogle Scholar
/ Lassad Neifar
  • Laboratoire de Biodiversité et Ecosystèmes Aquatiques, Département des Sciences de la Vie, Faculté des Sciences de Sfax, BP 1171, 3000 Sfax, Tunisia
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  • De Gruyter OnlineGoogle Scholar
/ Jordi Torres
  • Secció de Parasitologia, Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències l’Alimentació, Universitat de Barcelona, Av. Joan XXIII, s/n, 08028 Barcelona, Spain
  • Institut de Recerca de la Biodiversitat, Facultat de Biologia, Universitat de Barcelona, Av. Diagonal, 645, 08028 Barcelona, Spain
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  • De Gruyter OnlineGoogle Scholar
/ Jordi Miquel
  • Secció de Parasitologia, Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències l’Alimentació, Universitat de Barcelona, Av. Joan XXIII, s/n, 08028 Barcelona, Spain
  • Institut de Recerca de la Biodiversitat, Facultat de Biologia, Universitat de Barcelona, Av. Diagonal, 645, 08028 Barcelona, Spain
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-07-05 | DOI: https://doi.org/10.1515/ap-2017-0062

Abstract

The ultrastructural organization of the spermatozoon of the digenean Macvicaria obovata (Opecoelidae) is described by transmission electron microscopy. Alive digeneans were collected from the digestive tract of Sparus aurata (Teleostei, Sparidae), caught from the Gulf of Gabès in Chebba, Tunisia (Eastern Mediterranean Sea). The male gamete of M. obovata is a filiform cell, tapered at both extremities and exhibits typical characters such as two axonemes of different lengths showing the 9+‘1’ trepaxonematan pattern, a nucleus, mitochondria, two bundles of parallel cortical microtubules, external ornamentation of the plasma membrane, spine-like bodies and granules of glycogen. Cortical microtubules are absent in the anterior spermatozoon extremity and appear after the disappearance of the electron-dense material. The first mitochondrion is of moniliform type and it is associated with the external ornamentation of the plasma membrane and spine-like bodies. The second mitochondrion is more posteriorly located, reaching the nuclear region. The present study provides new data on the mature male gamete of M. obovata that may be useful for the understanding of digenean relationships and phylogenetic studies.

Keywords: Macvicaria obovata; Opecoelidae; Digenea; ultrastructure; spermatozoon

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About the article

Received: 2017-01-17

Revised: 2017-03-29

Accepted: 2017-03-30

Published Online: 2017-07-05

Published in Print: 2017-09-26


Citation Information: Acta Parasitologica, ISSN (Online) 1896-1851, ISSN (Print) 1230-2821, DOI: https://doi.org/10.1515/ap-2017-0062.

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Hichem Kacem, Sandra Blasco, Pilar Foronda, and Jordi Miquel
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