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zhan chong sheng zhi de yan jiu . sheng zhi xi tong de fa yu
Pages: 795-802
Year: Issue:  6
Journal: Acta Entomologica Sinica

Keyword:  粘虫生殖系统射精管交配囊粘液腺卵巢发育脂肪体蛹期发育成熟精子束;
Abstract: It may be a reliable and convenient way to ascertain the age of an armyworm mothaccording to the morphological characteristics of its reproductive system. The develop-ment of the reproductive systems in both sexes beginning from the prepupa stage wasstudied. Under constant temperature of 25℃, differentiation of the reproductive systemsin both sexes is completed on the fifth day of the pupal stage. However, the maturitystage of germ cells is different in both sexes. The spermatids are observable at thetime of adult emergence, whereas the oocytes could ripen only after the female moth hadtaken proper food. The development of eggs in the adult ovarioles may be divided intofour stages: (1) transparent opalescent stage, (2) yolk deposition stage, (3) mature stageand (4) post-oviposition stage. These four different stages may serve as the stand-ards for age determination of the female moths. The phenomenon of coalescence of thetestes was observed in the male pupa. In the adult stage the volume of the testes gra-dually decreases due to the elimination of sperm bundles. After emergence there was nodistinct change in the external appearance of the male reproductive system of differentages, so that age determination in male moths was difficult.
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