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2017-04

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/161874

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

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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.

Subject

Parasitologia, Espermatozoides, Ultraestructura (Biologia), Malalties dels peixos, Trematodes, Peixos marins, Filogènia, Mediterrània (Mar)

Subject (English)

Parasitology, Spermatozoa, Ultrastructure (Biology), Fish diseases, Trematoda, Marine fishes, Phylogeny, Mediterranean Sea

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Articles publicats en revistes (Biologia, Sanitat i Medi Ambient)
Articles publicats en revistes (Institut de Recerca de la Biodiversitat (IRBio))

Citation

KACEM, Hichem, et al. Ultrastructure of the spermatozoon of Macvicaria obovata (Digenea, Opecoelidae), a parasite of Sparus aurata (Pisces, Teleostei) from the Gulf of Gabès, Mediterranean Sea. Acta Parasitologica. 2017. Vol. 62, num. 3, pags. 520-528. ISSN 1230-2821. [consulted: 7 of August of 2026]. Available at: https://hdl.handle.net/2445/161874

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