Atypical Spermiogenesis in Thermobia domestica, a Thysanuran Insect


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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  1. 1

    Bawa, S. R., Nature, 188, 1132 (1960).

  2. 2

    Mathur, R. S., Nature, 188, 164 (1960).

  3. 3

    Gatenby, J. B., and Tahmisian, T. N., La Cellule, 60, 105 (1959).

  4. 4

    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).

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