opisthe

opisthe

1. The main process is: 1) the opisthe's oral primordium appears de novo under the pellical posterior to the buccal field, from which the AZM1, AZM2, PM and one of the frontal cirri will be derived;

其过程为：（1）后仔虫口原基出现在左缘棘毛内侧深层，其内的毛基体组装成整齐排列的小膜并分化成新AZM1，AZM2和口侧膜。

2. the paroral membrane and scutica of the opisthe originate from the anterior part of parental paroral membrane;

后仔虫的口侧膜及盾片来源于老口侧膜前段的增殖;

3. while membranelle 3 of the opisthe develops from the parental scutica;

后仔虫的小膜3来自于老口区盾片的增殖;