中国水蛇Enhydris chinensis(Gray)胚胎发育的研究

The Embryonic Development of the Snake, Enhydris chinensis(Gray)

中国水蛇Enhydris chinensis(Gray)为多黄卵、卵胎生动物。按照其外部形态和体节的增加,将胚胎发育划分为24个时期(图版Ⅰ—Ⅲ)。自受精卵的早期发育至小蛇形成,都是在子宫中进行的。有脐胎盘,产出的小蛇与母体相似。根据研究结果,讨论和分析中国水蛇胚胎发育的特点。

Twenty-four stages in the embryonic development of the snake, Enhydris chinensis(Gray), found in the suburbs of Fuzhou, Fujian Province were described. The staging based primarily on the morphological changes and somites' increasing as well as age and size of the embryo. Enhydris chinensts is ovoviviparous. The early development of fertilized eggs to the young snakes before parturition is in the uterus. They have omphaloplacenta.The characterisics of the embryonic development of Enhydris chinensis are analysed.