Cytodifferentiation in the accessory glands of Tenebrio molitor. I. Ultrastructure of the tubular gland in the post-ecdysial adult male

Authors

  • Njidda M. Gadzama,

    1. Department of Biological Science, Ahmadu Bello University, Zaria, Nigeria
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  • Christine M. Happ,

    1. Department of Zoology and Entomology, and Graduate Faculty of Cellular and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523
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  • George M. Happ

    Corresponding author
    1. Department of Zoology and Entomology, and Graduate Faculty of Cellular and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523
    • Department of Zoology and Entomology, and Graduate Faculty of Cellular and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523
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Abstract

The tubular accessory reproductive glands of the male mealworm beetle consist of a secretory epithelium surrounded by a thin muscular sheath. Each columnar secretory cell is divisible into three zones: basal which is adjacent to the muscle layer and contains rough endoplasmic reticulum and Golgi, intermediate, which contains endoplasmic reticulum and Golgi zones in the immature gland and is filled with secretory vesicles in the mature gland, and apical. Maturation also involves proliferation and organization of the rough endoplasmic reticulum in the basal and intermediate zone. The process appears to be complete at four days after ecdysis. Parallels with other insect glands and with the mammalian prostate are striking.

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