Spermiogenesis in the proteocephalidean cestode Proteocephalus torulosus (Batsch, 1786)

0157615 - PAU-O 20033002 RIV DE eng J - Journal Article
Bruňanská, Magdaléna - Nebesářová, Jana - Scholz, Tomáš
Spermiogenesis in the proteocephalidean cestode Proteocephalus torulosus (Batsch, 1786).
Parasitology Research. Roč. 90, č. 4 (2003), s. 318-324. ISSN 0932-0113. E-ISSN 1432-1955
R&D Projects: GA ČR GA524/01/1314; GA ČR GA206/03/1317
Institutional research plan: CEZ:AV0Z6022909
Keywords : cestoda * spermiogenesis * ultrastructure
Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine
Impact factor: 1.000, year: 2003

Spermiogenesis of the cestode Proteocephalus torulosus (Batsch, 1786) was examined for the first time using transmission electron microscopy. Spermiogenesis begins with the formation of a distal cytoplasmic protrusion, a differentiation zone, at the periphery of the early spermatid. This differentiation zone is lined with cortical microtubules and contains two centrioles. A flagellar bud arises from each centriole, growing later as a free flagellum. Simultaneously, a median cytoplasmic process (MCP) develops distally to the flagella. The two flagella, which are of unequal length, become longer and rotate towards the MCP. The nucleus elongates and when both flagella are fused with the MCP, the nucleus subsequently migrates into the MCP. Finally, the advanced spermatids detach from a condensing residual cytoplasm at the level of the arching membranes.
Permanent Link: http://hdl.handle.net/11104/0055053