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Fine Structure of the Reproductive System of a Frog Lung Fluke. III. The Spermatozoon and Its Differentiation

Paul R. Burton
The Journal of Parasitology
Vol. 58, No. 1 (Feb., 1972), pp. 68-83
DOI: 10.2307/3278243
Stable URL: http://www.jstor.org/stable/3278243
Page Count: 16
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Fine Structure of the Reproductive System of a Frog Lung Fluke. III. The Spermatozoon and Its Differentiation
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Abstract

Monopartite sperm of the frog lung fluke, Haematoloechus medioplexus, arise by fusion of three juxtaposed cytoplasmic processes that grow out from a spermatid. Paired centrioles serve as nucleation sites for the axial units that grow into the 2 lateral processes, while the nucleus migrates into the central process. Such basal bodies, and attached rootlets, may aid in stabilizing the threadlike processes so that fusion can efficiently occur; basal bodies or rootlets are not seen in a mature sperm. The sperm is about 400 µ long and less than 1 µ in diameter; the shaft resists bending, except for a terminal portion (25 to 50 µ) that undulates rapidly in living material. Typical transverse sections through the middle piece, which represents most of the shaft, show paired axial units, one on each side, a central mitochondrion, and two sets of cortical microtubules, some of which may be attached to the plasma membrane.

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