| 汤启友,王艳杰,王晓安.2011.人工授精平角涡虫早期胚胎和幼虫的扫描电镜观察.动物学杂志,46(4):66-71. |
| 人工授精平角涡虫早期胚胎和幼虫的扫描电镜观察 |
| Early Embryo and Larva of Planocera reticulata:in Vitro Fertilization and SEM Observation |
| 投稿时间：2010-11-04 修订日期：2011-05-19 |
| DOI： |
| 中文关键词: 多肠目 平角涡虫 胚胎发育 人工授精 扫描电镜 |
| 英文关键词:Polyclad Planocera reticulata Embryonic development In vitro fertilization Scanning electron microscope |
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| 中文摘要: |
| 为探明平角涡虫(Planocera reticulata)胚胎发育规律,采用人工授精方法,获得不同发育阶段的无卵外胶膜胚胎,并运用扫描电镜技术,观察了受精卵早期胚胎发育和幼虫发育。结果表明,从第3次卵裂开始表现出螺旋式卵裂的特征。在囊胚时期和原肠时期在动物极顶端有几个卵裂球向内下陷形成一凹陷。浮游幼虫期的幼虫利用体表纤毛营自由游泳生活,虫体沿腹中线分布1列向外凸出的长细胞。底栖爬行时期虫体体表纤毛逐渐减少,腹侧形成明显的口和咽。本文讨论了平角涡虫与本目其他涡虫卵裂方式、幼虫发育的异同,以及出现的动物极凹陷的意义。 |
| 英文摘要: |
| In order to study the early development of Planocera reticulata ,embryos without egg-shell and larva were obtained using in vitro fertilization, and examined by scanning electron microscopy (SEM). Typical spiral cleavage was observed since the third cleavage. Several micromeres at proximal end of animal pole tended to form an invagination during blastula and gastrula stages. Planktonic larva swam freely with the cilia, which were emanated from the epidermal plates. At the ventral surface of larva, a rank of long cells was situated on the ventral part of embryo along median line. Demersal larva sank to the bottom and opened the external mouth, while at that time the number of cilia decreased obviously. Our results allow a comparison between P.reticulate and other polyclad flatworms in cleavage pattern and larval development. The unexpected finding of a special apical invagination of the blastula and gastrula stage embryos in polyclad P.reticulata was discussed. |
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