Abstract
IN a recent communication, Bawa1 has again put forward the hypothesis of a typical sperm in Thermobia domestica. However, I have shown2, with some electron photographs of Petrobius maritimus, that the centriole and the acrosome are in their normal positions. The acrosome is a scoop-shaped body at the anterior end of the nucleus which forms a projecting tube. What Bawa has called the acrosome is probably another body, the centriole adjunct3, which encloses a centriole and gives rise to the flagellum. In Thysanura, no division of the centriole occurs, and as such it is a fixed body on the posterior aspect of the nucleus. These observations are further strengthened by the detailed cytochemical reactions obtained by me, the results of which will be published elsewhere.
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References
Bawa, S. R., Nature, 188, 1132 (1960).
Mathur, R. S., Nature, 188, 164 (1960).
Gatenby, J. B., and Tahmisian, T. N., La Cellule, 60, 105 (1959).
Mathur, R. S., Proc. Roy. Irish Acad., B (in the press).
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MATHUR, R. Atypical Spermiogenesis in Thermobia domestica, a Thysanuran Insect. Nature 190, 743 (1961). https://doi.org/10.1038/190743a0
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DOI: https://doi.org/10.1038/190743a0
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