Ultrastructure comparee de la spermiogenese et du spermatozoide de trois especes de Paravortex (Rhabdocoela, 'Dalyellioida', Graffillidae), Turbellaries parasites intestinaux de Mollusques
| Autor: | Nezha Noury-Sraïri, Jean-Lou Justine, Louis Euzet |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Axoneme
biology Spermatid Spermatozoon Centriole urogenital system Spermiogenesis royalty.order_of_chivalry royalty Anatomy Temnocephalida biology.organism_classification Rhabdocoela Cell biology medicine.anatomical_structure Genetics Ultrastructure medicine Animal Science and Zoology Molecular Biology Ecology Evolution Behavior and Systematics |
| Zdroj: | Zoologica Scripta. 18:161-174 |
| ISSN: | 1463-6409 0300-3256 |
| DOI: | 10.1111/j.1463-6409.1989.tb00442.x |
| Popis: | Three species of the genus Paravortex were studied. Spermiogenesis involves progressive lengthening of the spermatid. No centriole nor axoneme were found. Thc mature spermatozoon is threadlike, 30μm long and aflagellate. It contains a nucleus, two longitudinal parallel mitochondria, numerous dense bodies limited by a membrane, a row of cortical microtubules and granules. The spatial arrangement of the microtubules wah deduced from a statistical analysis of their number in transverse section. The microtubules are continuous along the length of the spermatozoon and are arranged along a long cone. The granules, not limited by a membrane, are about 25 nm in diameter. They are arranged in a semicircle and represent a new structure for sperm of Platyhclminthes. A statistical comparison demonstrated that two species may be distinguished by the number of their cortical sperm microtubules. This is the tirst ultrastructural study of an aflagellate spermatozoon in the Rhabdocoela. A rickettsia was found in P. cardii. |
| Databáze: | OpenAIRE |
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