Ultrastructure of spermatogenesis of the anoplocephalid cestode Gallegoides arfaai [Mobedi et Ghadirian, 1977] Tenora et Mas-Coma, 1978

• Autorzy: Miquel J , Swiderski Z. , Mlocicki D. , Eira C. , Marchand B.
• Języki publikacji: EN

Abstrakty

EN

Spermatogenesis in Gallegoides arfaai is similar to that described for other cestode species. Six incomplete synchronic cytokineses occur: four mitotic and two meiotic cell divisions. The primary spermatogonium divides forming two secondary spermatogonia. All further divisions occur simultaneously, resulting in a rosette of four tertiary, then eight quaternary spermatogonia and sixteen primary spermatocytes. The first meiotic division forms thirty-two secondary spermatocytes and after the second meiotic division sixty-four spermatids are formed. Spermiogenesis begins with the formation of a differentiation zone in the form of a conical projection of cytoplasm delimited by a ring of arching membranes. Within this area there are two centrioles, a centriolar adjunct and vestigial striated rootlets. During spermiogenesis, only one of the centrioles develops an axoneme that grows directly into the cytoplasmic extension. The other centriole remains oriented in a cytoplasmic bud and posteriorly aborts. The nucleus elongates and moves into the cytoplasmic extension. Granular material present in each sperm originates from electron-dense material present in the periphery of the spermatid. In the final stage of spermiogenesis two crest-like bodies appear at the Bâse of the spermatid. Finally, the ring of arching membranes constricts and the young spermatozoon detaches from the residual cytoplasm. In order to increase homogeneity in the designation of the non-typical striated rootlets previously described, in this study we propose to group them under the common designation of "vestigial striated rootlets" and its importance is discussed according to previous findings of related structures in other cyclophyllideans.

Słowa kluczowe

EN

Cestoda; Gallegoides arfaai; anoplocephalid cestode; spermatogenesis; ultrastructure; Anoplocephalidae

• Wydawca: -
• Czasopismo: Acta Parasitologica
• Rocznik: 2005
• Tom: 50
• Numer: 2
• Opis fizyczny: p.132-144,fig.,ref.

Twórcy

autor

Miquel J

• Universitat de Barcelona, Av.Joan XXIII s/n, E-08028 Barcelona, Spain

autor

Swiderski Z.

autor

Mlocicki D.

autor

Eira C.

autor

Marchand B.

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