论文部分内容阅读
本文观察研究淡水单孔蚓Monopylephorus limosus繁殖和发育。成虫采自舟山本岛,体长30-80 mm,体节数86-145。精巢位于第Ⅸ节,卵巢位于第Ⅹ节。精漏斗大,输精管膨管状。雄性导管和受精囊成对。雄孔开口于第Ⅺ节,受精囊孔位于Ⅸ/Ⅹ节。无阴茎鞘。成熟个体环带不明显。茧呈各种形状,通常为椭圆形,长径1.25-5 mm、短径0.7-2 mm,内含0-59个卵。单孔蚓的早期胚胎发育和某些多毛类很相似,卵裂为螺旋型卵裂。外包和内陷法形成原肠。培养水温在17-19℃时,约经20天幼蚓就破茧而出,孵化率为80%。幼蚓经90天可成为成体,成活率为90%。110天左右产卵,繁殖期为4-10月。繁殖适温为16-23℃。一年可繁殖2代,多至3代。
In this paper, we study the reproduction and development of Monopylephorus limosus. Adults collected from the island of Zhoushan, body length 30-80 mm, the number of body sections 86-145. The testes are in Section IX and the ovaries are in Section X. Funnel big, vas deferens tube. Male catheter and seminal vesicles paired. The male hole is open in section XI and the seminal vesicle is in section IX / X. No penile sheath. Mature individual annulus is not obvious. The cocoon takes on a variety of shapes, usually oval, 1.25-5 mm long, 0.7-2 mm short, containing 0-59 eggs. The development of early embryo of monoecious earthworms is similar to that of some polychaetes, and the cleavage is a helical cleavage. Outsourcing and retraction method to form the original intestines. Cultivation of water temperature at 17-19 ℃, about 20 days after the young earthworm cocoon out, the hatching rate was 80%. After 90 days young adults can become adults, the survival rate of 90%. About 110 days to lay eggs, breeding season for the April-October. Breeding temperature suitable for 16-23 ℃. One year can breed 2 generations, up to 3 generations.