A TRANSMISSION ELECTRON MICROSCOPE EXAMINATION OF HEMIPTERAN AND LEPIDOPTERAN GONIAL CENTROMERES

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Abstract
A transmission electron micrograph study indicates that the material identified as the centromere in gonial mitotic cells is more localized in the lepidopterans, Ephestia kuehniella (Zeller) and Trichoplusia ni (Hübner), than in the hemipteran, Oncopeutus fasciatus (Dallas). The lepidopteran centromeres are similar in size to the centromeres found in several monokinetic species. In O. fasciatus the mitotic nuclear envelope disappears while the E. kuehniella and T. ni nuclear envelopes persist during division. Factors other than the extent of the centromere material may be involved in making the Lepidoptera more resistant to radiation sterilization than the Hemiptera.