The chief site of excretion (especially the filter role) is coelomosac and its podocytes,and the osmoregulatory site in excretory organs is the canal portion.

• 2．排泄尤其是最主要的过滤功能的主要生理功能部位为体腔囊及其足细胞，而排泄器官中渗透压调节的主要功能活动部位是管状部。