蟋蟀雄性生殖系统的结构和精子发生

The Structure of the Male Reproductive System and the Genesis of the Generative Cells in Scapsipedes Micado Saussure

研究了蟋蟀雄性生殖系统的结构和精子发生的动态过程 .成熟的雄性生殖系统主要由一对精巢 ,一对输精管 ,一对附腺 ,一对储精囊和一根射精管组成 .精巢乳白色由许多精巢管盘曲组成 ,精巢管包括原精区、生长区、成熟区和变形区四个区域 .其主要特点是处于不同发育时期的精母细胞呈放射状密集排列在圆球形的育精囊中 .精子发生的动态是 :一龄期 ,精巢小管仅具一些精原细胞 ;二～三龄期 ,精原细胞不断通过有丝分裂增殖 ;四龄期 ,初级精母细胞形成 ,并由减数分裂形成次级精母细胞 ;五龄期 ,精细胞大量形成 ,并变形成为精子 .其主要特点是成虫期的精巢管中存在所有各期生殖细胞 ,当下端的精子成熟时 ,上端部分的精母细胞再发育形成精子 。

This paper deals with the structure of the reproductive system and the development of the germinative gland of the Scapsipedus micado saussure based on artifical reproduction. The mature male reproductive system is composed of testis, vas deferens, accessory glands, seminal vesicles and ejaculatory duct. The testis of the adult contained a great number of testicular tubules that subdivided into four zones such as: spermatogonia, growth, transformation and maturation. The main characteristic was all developing spermatocytes crowded together within sperm cyst. The spermatogenesis of the Scapsipedum micado saussure was: in the first instar, only a few spermatogonias were in the testiculartuble,the spermatogonia number was increased at the second instar. During the forth to the fifth instar,the primary spermatocyte developed into secondary spermatocyte by mitotica. In the fifth instar, some spermatocytes formed into spermatids and then transformed into sperms.All developing reproductive cells existed in testicular. It was clear that the Scapsipedum micado saussure started to produce sperms after the fifth instar.