miracidium of Megalodiscus temperatus showing the excretory ducts (ED) of the flame cells.  The nuclei of the cells from which the ducts are constructed are seen as well (AN).  This photo was taken of a live miracidium using phase contrast microscopy.  1000x

miracidium of Megalodiscus temperatus revealing one of the flame cells (FC) and the excretory duct (ED) leading from it.  The nuclei of the ducts (AN) can also be seen.  The secretory sac (SS) and a cluster of nuclei (LN) are apparent.  1000x