1. Spermatological characteristics of Sclerodistomoides pacificus (Digenea, Sclerodistomoididae) a parasite of the flying fish Cheilopogon pinnatibarbatus (Teleostei, Exocoetidae).
- Author
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Bâ A, Bakhoum AJS, Ndiaye PI, Bâ CT, Marchand B, and Quilichini Y
- Subjects
- Animals, Axoneme metabolism, Axoneme ultrastructure, Male, Parasites ultrastructure, Spermatozoa ultrastructure, Trematoda ultrastructure, Fishes parasitology, Parasites cytology, Spermatozoa cytology, Trematoda cytology
- Abstract
Sclerodistomoides pacificus is the only species described now in Sclerodistomoididae. We present in this paper the first ultrastructural data of the mature spermatozoon of a species from the genus Sclerodistomoides. Adult specimens of S. pacificus (Digenea: Hemiuroidea: Sclerodistomoididae), were parasites of the gall-bladder of the teleost fish Cheilopogon pinnatibarbatus captured in the Atlantic Ocean, near Dakar (Senegal). The male gamete is a filiform cell which exhibits a similar ultrastructural organization to that reported in most species belonging to the Hemiuroidea with two axonemes of the 9 + '1' pattern of trepaxonematans, a nucleus, a mitochondrion, external ornamentation of the plasma membrane not associated with cortical microtubules and located in the anterior region of the spermatozoon, and parallel cortical microtubules disposed in one side of the spermatozoon. However, the present study allowed describing for the first time a moniliform mitochondrion in the Hemiuroidea. The presence of a moniliform mitochondrion and the absence of filamentous external ornamentation described in other Hemiuridae: Lecithochirium microstomum, L. musculus and Hemiurus appendiculatus are a good tool for phylogenetic purposes in the Hemiuroidea. Moreover, spermatological organisation and model are discussed in context with those of previous studies in the Hemiuroidea., Competing Interests: Declaration of Competing Interest The authors declare that they have no conflict of interest., (Copyright © 2019 Elsevier Ltd. All rights reserved.)
- Published
- 2020
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