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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.

acta parasitologica

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