miracidium of Megalodiscus temperatus stained with Nile blue sulfate.  The apical gland (AG), nucleus of the apical gland (NA), penetration gland (PG), brain or ganglion (BR), nucleus of a cell of the brain (NB), secretory sac (SS), one of the nuclei of the secretory sac (NS), germ ball (GB) and cilia (CI) can be seen.  The organism is syncytial and cell membranes do not separate adjacent cells.  Each of the above organs listed are multinucleate.  1000x
 

miracidium of Megalodiscus temperatus stained with the vital stain, Nile blue sulfate.  The apical gland (AG), pore of the apical gland (PO), pore of an accessory gland (AP), duct of a penetration gland (DP), brain or ganglion (BR), secretory sac (SS), nucleus of an epidermal plate of the first row (NR-1), and cilia (CI).  2000x