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Title: Spermiogenesis and spermatozoon ultrastructure of the dilepidid cestode Molluscotaenia crassiscolex (von Linstow, 1890), an intestinal parasite of the common shrew Sorex araneus
Author: Marigo, Adji Mama
Bâ, Cheikh Tidiane
Miquel Colomé, Jordi
Keywords: Espermatogènesi
Ultraestructura (Biologia)
Ultrastructure (Biology)
Issue Date: Apr-2011
Publisher: Blackwell
Abstract: Spermiogenesis in Molluscotaenia crassiscolex begins with the formation of a differentiation zone containing two centrioles. One of the centrioles develops a flagellum directly into the cytoplasmic extension. The nucleus elongates and later migrates along the spermatid body. During advanced stages of spermiogenesis, a periaxonemal sheath appears in the spermatid. Spermiogenesis finishes with the appearance of a single helicoidal crested body at the base of the spermatid and, finally, the narrowing of the ring of arched membranes causes the detachment of the fully formed spermatozoon. The mature spermatozoon of M. crassiscolex exhibits a partially detached crested body in the anterior region of the spermatozoon, one axoneme, twisted cortical microtubules, a periaxonemal sheath, and a spiralled nucleus. The anterior spermatozoon extremity is characterized by the presence of an electron-dense apical cone and a single spiralled crested body, which is attached to the sperm cell in the anterior and posterior areas of region I, whereas in the middle area it is partially detached from the cell. This crested body is described for the first time in cestodes. The posterior extremity of the male gamete exhibits only the disorganizing axoneme. Results are discussed and compared particularly with the available ultrastructural data on dilepidids sensu lato.
Note: Versió postprint del document publicat a:
It is part of: Acta Zoologica, 2011, vol. 92, num. 2, p. 116-125
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ISSN: 0001-7272
Appears in Collections:Articles publicats en revistes (Biologia, Sanitat i Medi Ambient)

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