Abstract

During the development of a sterile male control method for Dermestes frischii Kugelann males were exposed to an X-ray dose of 3.0 krad. The treated testis follicles were investigated using light and electron microscopy. Abnormalities in spermatids and sperm were observed only in cells treated as primary or secondary spermatocytes. Malformed nuclei, nebenkern and acrosomes were detected. Cells frequently failed to start or complete the first or second meiotic divisions. However, spermiogenesis was not inhibited and this resulted in the formation of pseudospermatids of which three types were identified. Only one of these has been previously described. Pseudospermatids were associated with two, three or four sets of quite normal tail organelles. The presence of multiple organelles is discussed in relation to similar findings in other insects.

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