This produces within itself numbers of a small creature which is called the redia form. |
Larval stages of some medically important species include miracidium, redia, cercaria, and metacercaria. |
The redia has anteriorly a mouth leading into a muscular pharynx and thence into a ccal stomach. |
The Cercari when fully developed leave the sporocyst or Redia, and then their host, and become free. |
The Cercari are developed from spherical masses of cells found in the body cavity of the sporocyst or Redia. |