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Ultrastructure of spermatozoa from the American oyster Crassostrea virginica
Daniels, E.W.; Longwell, A.C.; McNiff, J.M.; Wolfgang, R.W. (1971). Ultrastructure of spermatozoa from the American oyster Crassostrea virginica. Trans. Am. Microsc. Soc. 90(3): 275-282
In: Transactions of the American Microscopical Society. Blackwell Publishing: Lawrence, Kan., etc.,. ISSN 0003-0023, more
Peer reviewed article  

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  • Daniels, E.W.
  • Longwell, A.C.
  • McNiff, J.M.
  • Wolfgang, R.W.

    The nucleus of C. virginica spermatozoon is invaginated antero-posteriorly enclosing a mass consisting of many small vesicles, the axial body. A centrally located filament extends through the axial body from its base to the apex of the acrosome. The acrosome is enclosed by its own membrane, and it caps the axial body while somewhat depressing the anterior rim of the nucleus. A small subnuclear fossa, in the center of the distal surface of the nucleus, is enclosed within the 2 membranes of the nuclear envelope. A proximal, transverse centriole and a distal, longitudinal centriole are located in the center of the middle piece surrounded laterally by 4 mitochondria. A centriolar satellite often is found between the proximal centriole and the subnuclear fossa. The flagellum, continuous with the distal centriole, contains the characteristic 9+2 configuration of microtubules. The diam of the end piece, smaller than that of the body of the flagellum, has a cylindrical bundle of 9 single microtubules uniformly spaced around a center pair.

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