The Acrosome and Its Differentiation during Spermiogenesis in Halocynthia roretzi : Ascidiacea, Tunicata

概要

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The spermatozoa of Halocynthia roretzi have architectural features characteristic of ascidian spermatozoa that have been previously described. They have an elongated head (approximately 5.5 μm in length) and a single mitochondrion which is closely applied laterally to the nucleus. They lack a midpiece. An acrosome is present at the apex of the sperm head. The acrosome of H. roretzi spermatozoa is a depressed sphere, approximately 125×125×40 nm. At an early stage of spermiogenesis a vesicle (about 50 nm in diameter) appears in a blister at the apex of each spermatid. During spermiogenesis this vesicle becomes larger (approximately 100 nm in diameter). The vesicle in the blister contains moderately electron-dense material located along the vesicle membrane. At the completion of spermiogenesis the vesicle is most probably flattened by the elongating nucleus and transforms into an acrosome.
社団法人日本動物学会の論文
1993-02-15