Abstract
The fine structure of spermiogenesis in the bivalve, Laternula limicola , was observed. Particular emphasis is paid to the differentiation of a structure homologous to the acrosome and termed the temporary-acrosome by the author. Electron-dense vesicles arise from the Golgi complex in the spermatocytes. The vesicles coalesce to form the “temporary-acrosome” in early spermiogenesis. The structure is tentatively located at the anterior part of the head of the spermatid and then moves to the posterior part of the mitochondrial midpiece. The spermatozoon has a tapering nucleus, and no acrosomal structure can be found at the apex.
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