FLATWORMS and related phyla
(Bilateral animals without any coelom)








VIDEO: Planaria locomotion





Chinese liver fluke (Clonorchis sinensis) life cycle



The Clonorchis life cycle is facilitated by the planting of rice seedlings in water terraces a few inches deep, as shown here.
Notice the rice farmer's feet in the previous image, and the snails around him.











Evolution of BODY CAVITIES: