| Dastarcus helophoroides (Faimaire) is a potentially valuable natural enemy for prominent biological control agent against Anoplophora glabripennis (Motschulsky) and Monochamus alternatus and so on.The long-term laboratorial breeding observation revealed that if given sufficient forage and suitable condition, the adult D. helophoroides could live more than12years with a continuous oviposition, but the fecundity would drop dramatically after3years. In order to discuss the relationship between aging and the decline of the fecundity from the view of reproductive system variation, we study the Morphology of reproductive from both male and female adult D. helophoroides.1. The male reproductive system of D. helophoroides includes a pair of testes, two pair of lateral seminiferous ducts and one pair of median seminiferous ducts, one pair of vesicula seminalis, one pair of mesodenia and four pair of ectadenia. Each testes has two testicles,and the four pair of ectadenia form a globular structure.2. The formation process of sperm bundles of D. helophoroides includes four stages, that is spermatocyte elongation, sperm deformation and flagellate elongation, sperm bundles mature and sperm bundles transform. The long of sperm is80-100um, and have inflated acrosome and spindly flagellum.3. The female reproductive system of D. helophoroides includes one pair of ovaries, a pair of lateral oviducts, a common oviduct, a spermatheca, a spermathecal gland, an enlarged accessory glands. ovary consists of66to176tube-like ovarioles and with telotrophic ovarioles.4. The female reproduction system of D. helophoroides has the inflated accessory galnds compared to other insects with glands are significantly different.5. The difference of the morphology of ovarioles among different ages to years were obvious, mainly showed the germarium length decreases with the age increasing, simultaneously, and part of it tended to be empty. It may result in one reason that the decline of daily oviposition was related... |
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