Ultrastructural characteristics of the mature spermatozoon of the digenean Sclerodistomum italicum (Stossich, 1893) (Hemiuroidea, Sclerodistomidae) intestinal parasite of Hypocanthus amia (Teleostei, Carangidae). Issue 1 (February 2017)

• Record Type: Journal Article
• Authors: Ndiaye, Papa Ibnou; Quilichini, Yann; Marigo, Adji Mama; Bâ, Cheikh Tidiane; Tkach, Vasyl V.; Marchand, Bernard
• Is Part Of: Tissue & cell. Volume 49:Issue 1(2017)
• Page Start: 15
• Page End: 21
• Publication Date: 2017-02
• Subjects: Digenea -- Sclerodistomidae -- Sclerodistomum italicum -- Sperm -- Ultrastructure; Cytology -- Periodicals; 571.5
• DOI: 10.1016/j.tice.2016.12.007
• Languages: English
• ISSNs: 0040-8166

Abstract

Highlights: This paper provide the first ultrastructural data of the spermatozoon of a species becoming to the genus Sclerodistomum, . It's described for first time in this work, the presence of two types of extramembranous ornamentations in the mature spermatozoon of a digenean, . The presence of short cortical microtubules in the anterior part of the spermatozoon in addition to the presence of only one bundle of cortical microtubules in the median part of the spermatozoon, . In accordance to the others mature spermatozoa described in Hemiuroidea, the spermatozoon of Sclerodistomum italicum lack spine-like body. 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.