ABSTRACT In the present study, videos were recorded to observe oviposition in living, mature worms of Tubifex tubifex. After the formation of a lemon shaped cocoon around the clitellum at segments 11 and 12, mature eggs that have been stored in the ovisac at segments 12–14 begin to move into segments 11–12 through the constricted posterior end of the cocoon. Within a second or so, ovisac eggs emerge out of the posterior margin and return to the posterior segments. Such movements are repeated several times before the ovisac eggs settle in the ovarian coelom of segment 11. Within a few seconds of the eggs moving into the ovarian coelom, the clitellar region begins to change its contour slightly; it looks as if something round is tapping on the coelomic wall of this region. As this tapping ceases, the coelomic eggs begin to move to the space between the cocoon and the clitellum. Coelomic eggs are individually squeezed out of the female gonopores located near the midpoint of the cocoon. This process, referred to as egg deposition, is accomplished within 30 s. The egg deposition is followed by the backward withdrawal of the anterior segments from the cocoon.

中文翻译：

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阴蒂环节动物 Tubifex tubifex 的产卵行为：实验室培养条件下成熟蠕虫的视频记录

摘要 在本研究中，录制了视频以观察 Tubifex tubifex 活体成熟蠕虫的产卵。在第 11 和第 12 节的阴蒂周围形成柠檬形茧后，已储存在第 12-14 节卵囊中的成熟卵开始通过茧的收缩后端进入第 11-12 节。在大约一秒钟内，卵囊卵从后缘出现并返回到后段。在卵囊进入第 11 段卵巢体腔之前，这种运动会重复多次。在卵进入卵巢体腔的几秒钟内，阴蒂区域开始略微改变其轮廓；看起来好像有什么东西在敲击这个区域的体腔壁。当这个敲击停止时，体腔卵开始移动到茧和阴蒂之间的空间。体腔卵从位于茧中点附近的雌性生殖孔中单独挤出。这个过程称为卵子沉积，在 30 秒内完成。卵沉积之后是前段从茧中向后撤回。