Platyhelminthes:
Phylum of worms having bilateral symmetry and a soft, usually flattened body, compris-ing the flatworms. Flatworms lack an actual cardiovascular system because they are so dependent on their host.
Phylum of worms having bilateral symmetry and a soft, usually flattened body, compris-ing the flatworms. Flatworms lack an actual cardiovascular system because they are so dependent on their host.
Here is a nice song about the Platyhelminthes species: