东北小鲵生态的初步观察

The Preliminary Observation of the Ecology of Hynobius Leachit

通化产东北小鲵(Hynobius leechit)为体外受精,精子形态似针状,分头、体、尾三部分,产卵在傍晚17点至次日凌晨3—4点,胚体从受精卵到孵出卵膜历时 15天左右,一般在每年的 5月中句均已孵出,孵出时幼体前肢芽突起明显,未分叉.胚胎和胚后发育共27个分期.

Hynobius leachit produces new offsprings by outdoor insemination. The spermatozoa looks likeneedles. A spermatozoon comsists of head, body and tail. It lays eggs from 5 a. m to 3--4o'clock of the next morning. The embrgos spend about 15 days to hatch from inseminatedeggs. That is to say, the embryos have hatched in middle May of each year. When the embryoshatch, they have obvious protrusions of frant limbs, and the protrusions have not branches.There are 27 stages during the imbrgonic and after-embryonic development.