1. Ultrastructure of spermiogenesis and the spermatozoon of Macracanthorhynchus hirudinaceus (Pallas, 1781) (Acanthocephala: Archiacanthocephala), a parasite of the wild boar Sus scrofa
- Author
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Bernard Marchand, Julia-Laurence Culioli, Joséphine Foata, Parasites et Ecosystèmes Méditerranéens (PEM), Centre National de la Recherche Scientifique (CNRS)-Université Pascal Paoli (UPP), Sciences pour l'environnement (SPE), and Marchand, Bernard
- Subjects
0106 biological sciences ,Axoneme ,Male ,MESH: Swine Diseases ,Spermiogenesis ,Sus scrofa ,01 natural sciences ,MESH: Spermatocytes ,MESH: Helminthiasis, Animal ,Acanthocephala ,Spermatocytes ,MESH: Animals ,Centrioles ,Swine Diseases ,0303 health sciences ,biology ,Spermatozoon ,Synaptonemal Complex ,MESH: Spermatozoa ,Spermatids ,Spermatozoa ,Chromatin ,medicine.anatomical_structure ,Flagella ,MESH: Microscopy, Electron, Transmission ,Helminthiasis, Animal ,MESH: Spermatogenesis ,[SDV.MP.PAR] Life Sciences [q-bio]/Microbiology and Parasitology/Parasitology ,MESH: Spermatids ,Zoology ,Animals, Wild ,Archiacanthocephala ,010603 evolutionary biology ,MESH: Flagella ,MESH: Synaptonemal Complex ,MESH: Chromatin ,03 medical and health sciences ,Macracanthorhynchus hirudinaceus ,Microscopy, Electron, Transmission ,medicine ,Animals ,MESH: Animals, Wild ,[SDV.MP.PAR]Life Sciences [q-bio]/Microbiology and Parasitology/Parasitology ,Spermatogenesis ,Ecology, Evolution, Behavior and Systematics ,030304 developmental biology ,Spermatid ,MESH: Centrioles ,MESH: Acanthocephala ,biology.organism_classification ,MESH: Male ,MESH: Sus scrofa ,Ultrastructure ,Parasitology - Abstract
International audience; The present paper describes the ultrastructure of spermiogenesis and the spermatozoon of Macracanthorhynchus hirudinaceus, an acanthocephalan parasite of the wild boar Sus scrofa. At the beginning of spermatogenesis, spermatocytes exhibit synaptonemal complexes and 2 centrioles. In the spermatid, only 1 centriole remains, generating a flagellum with a 9+2 pattern. Another ultrastructural feature observed during the spermiogenesis of M. hirudinaceus is the condensation of the chromatin, forming a "honeycomb" structure in the old spermatid and a homogeneous, electron-dense structure in the spermatozoon. The mature spermatozoon of M. hirudinaceus presents a reversed anatomy, as has been described previously in other species of the Acanthocephala. The spermatozoon is divided into 2 parts: an axoneme, and a nucleocytoplasmic derivative. The spermatozoon flagellum exhibits a 9+2 or 9+0 pattern. The process of spermiogenesis and the ultrastructural organization of the spermatozoon of M. hirudinaceus are compared with available data regarding other acanthocephalan species.
- Published
- 2005