Reproductive behaviour and physiology of Tenebrio molitor (Coleoptera: Tenebrionidae). III. Histogenetic changes in the internal genitalia, mesenteron, and cuticle during sexual maturation

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Abstract
The histogenic changes in the internal genitalia and mesenteron and the hardening and darkening of the cuticle during the first days of adult life in Tenebrio molitor L. are described. At emergence, the testes contain mature spermatozoa and the ovaries possess small oocytes. During the first 3 days, the shape, size, appearance, and staining characteristics of the secretory cells of the lateral oviducts, female accessory gland, tube accessory glands, bean-shaped accessory glands, and glandular region of the vasa deferentia change. Similar changes were not seen in the seminal vesicles and spermatheca. All of the secondary sex glands are filled with secretion by day 4. In the midgut, changes occur in the size, shape, and appearance of the epithelial cells by the 3rd day, and a peritrophic membrane is secreted during days 2 and 3. Most adults do not begin to feed until after the 3rd day. By day 3, the hardening and darkening of the cuticle are completed. All of these changes clearly are associated with adult maturation, especially sexual maturation, and most or all of the them must take place before the adults are able to copulate and oviposit.