Eckelbarger K J, Chia F S
Cell Tissue Res. 1978 Jan 17;186(2):187-201. doi: 10.1007/BF00225530.
The development of the egg envelope and its incorporation into the larval cuticle of the polychaete Phragmatopoma lapidosa, was studied by correlative scanning and transmission electron microscopy. The mature egg possesses an envelope composed of five zones including an outer granular zone formed by the tips of the egg microvilli. The formation of the granules is described and their functions are discussed. The entire egg envelope is retained as the larval cuticle up to the 16 h trochophore stage. From this stage to about the 60 h larval stage, the envelope is gradually lost and replaced by a cuticle consisting of branching microvilli. The cuticle of the 20 day larva is composed of highly branching microvilli penetrating a homogeneous electron opaque cuticle. The possible functions of the cuticle among the Annelida are discussed.
通过相关的扫描电子显微镜和透射电子显微镜研究了多毛纲动物石纹盘管虫（Phragmatopoma lapidosa）卵膜的发育及其融入幼虫角质层的过程。成熟的卵具有由五个区域组成的包膜，包括由卵微绒毛尖端形成的外部颗粒区。描述了颗粒的形成并讨论了它们的功能。整个卵膜在16小时的担轮幼虫阶段之前一直作为幼虫角质层保留。从这个阶段到大约60小时的幼虫阶段，包膜逐渐消失并被由分支微绒毛组成的角质层所取代。20日龄幼虫的角质层由穿透均匀电子不透明角质层的高度分支微绒毛组成。讨论了环节动物中角质层的可能功能。
