Ultrastructural Study of Spermiogenesis and the Spermatozoon of Microcotyle pancerii (Monogenea: Polyopisthocotylea: Microcotylidae), Parasite of Meagre Argyrosomus regius (Pisces: Teleostei)

The present work deals with the ultrastructure of spermiogenesis and the spermatozoon of Microcotyle pancerii, a gill parasite of meagre Argyrosomus regius collected in Corsican fish farms. Spermiogenesis was rather similar to that observed in other polyopisthocotylean Monogenea. The intercentriolar...

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Bibliographic Details
Published in:The Journal of parasitology 2009-04, Vol.95 (2), p.261-270
Main Authors: Quilichini, Yann, Foata, Joséphine, Marchand, Bernard
Format: Article
Language:English
Subjects:
Animals
Aquaculture
Argyrosomus regius
Biological and medical sciences
Centrioles
Chromatin
Development
Farms
Fish Diseases - parasitology
Fish farms
Fisheries
Flagella
France
Fundamental and applied biological sciences. Psychology
General aspects
General aspects and techniques. Study of several systematic groups. Models
Gills - parasitology
Invertebrates
Male
Microcotyle
Microcotylidae
Microscopy, Electron, Transmission - veterinary
Microtubules
Mitochondria
Monogenea
Nemathelminthia. Plathelmintha
Parasites
Parasitology
Perciformes - parasitology
Pisces
Platyhelminths - physiology
Platyhelminths - ultrastructure
Polyopisthocotylea
Spermatids
Spermatogenesis
Spermatozoa
Spermatozoa - ultrastructure
Spermiogenesis
Teleostei
Trematode Infections - parasitology
Trematode Infections - veterinary
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Summary:The present work deals with the ultrastructure of spermiogenesis and the spermatozoon of Microcotyle pancerii, a gill parasite of meagre Argyrosomus regius collected in Corsican fish farms. Spermiogenesis was rather similar to that observed in other polyopisthocotylean Monogenea. The intercentriolar body was different from that described in digeneans. The nuclear condensation occurred in 2 successive stages. First, during the nuclear migration in the median cytoplasmic process, the nucleus developed a honeycomb-like appearance. Then, after the flagellar fusion, a discontinuous twisting of the chromatin appeared along the nucleus, with this process ending in total nuclear condensation. The structure of the spermatozoon is characterized by 2 axonemes (9 + “1” pattern), a single and continuous field of cortical microtubules, a mitochondrion, and a nucleus. Our findings were compared with various ultrastructural features in order to highlight variability within the group.
ISSN:0022-3395
1937-2345
DOI:10.1645/GE-1302.1