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The fine structure of the sperm and spermatid differentiation in the brown mussel perna perna



The fine structure of the sperm and spermatid differentiation in the brown mussel perna perna



South African Journal of Zoology 20(1): 5-9



The mature sperm of P. perna is 50-55 .mu.m long and comprises 3 regions, a head, a mid-piece and a tail. The head incorporates a round electron-dense nucleus and an elongated cone-shaped acrosome. The mid-piece consists of a ring of 5 mitochondria, in the center of which is the distal centriole from which the tail arises. The early spermatid is characterized by a large nucleus and perinuclear cytoplasm containing numerous mitochondria and proacrosomal vesicles. By mid-spermiogenesis the nuclear chromatin begins to condense, the proacrosomal vesicles coalesce to form the acrosome and the mitochondria are reduced to 5. At this stage the tail first appears. During late spermiogenesis the acrosome elongates and invaginates on its adnuclear surface. The structure of the sperm of P. perna is similar to that of other mytilaceans, thus supporting the contention that sperm ultrastructure could be used in studies on bivalve phylogeny.

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Accession: 006677815

Download citation: RISBibTeXText

DOI: 10.1080/02541858.1985.11447904


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