宽体金线蛭生殖系统形态结构与胚胎发育

宽体金线蛭是一种被广泛人工养殖的药用动物,其繁殖力的提高有利于增加养殖者的经济效益,取宽体金线蛭种蛭在室内养殖于自制的水蛭水族箱,取材进行解剖和石蜡切片,观察其生殖系统的形态结构.在宽体金线蛭产下卵茧后,观察其胚胎发育的主要阶段.实验结果表明:(1)宽体金线蛭是雌、雄同体的动物,其雄性生殖系统包括精巢、输精管、贮精囊、射精球、前列腺、阴茎鞘和雄孔几部分,雌性生殖系统包括卵巢、输卵管、蛋白腺、阴道囊和雌孔几部分;(2)宽体金线蛭卵茧产下约3h,受精卵进入二细胞期,约8h进入4细胞期,约12h进入8细胞期,约1d进入多细胞期,约3d进入囊胚期,约5d进入原肠胚期,约28d孵出幼蛭.

Morphological Structure of the Genital System and Embryonic Development of Whitmania pigra

Whitmania pigra is widely farmed as a medicinal animal, and the increase of its fecundity can improve the economic benefits of farmers. In order to provide reference for artificial reproduction of this leech, a research of the morphological structure of its reproductive system and its embryo development was carried out. Leeches (W. pigra) were cultivated in a self-made leech aquarium and the morphological structure of their reproductive system was observed based on anatomy and paraffin section. The major phases of embryonic development were observed when the egg cocoon was laid. The results showed that W. pigra was an androgynous animal. The male reproductive system consisted of the testis, the vas deferens, the seminal vesicle, the ejaculatory bulb, the prostate gland, the cirrus sac and the epiandrum, and the female reproductive system included the ovary, the oviduct, the albumen gland, the vaginal sac and the female''s orifice. The fertilized eggs of W. pigra entered the 2-cell stage, the 4-cell stage, the 8-cell stage, the multi-cell stage, the blastula stage and the gastrula stage in about 3h, 8h, 12h, 1 day, 3 days and 5 days, respectively, after egg cocoons were laid, and larvae hatched on the 28th day.