What is Phylum Platyhelminthes - Flatworms ?
This Class consists of the free-living flatworms, the best known of which is the Genus Planaria. Most of the species in this class live in marine habitats, but Planaria is found in fresh water. Planaria have strong regenerative abilities. If cut in half, each half is able to grow another missing half, resulting in two new organisms. This regeneration can be experimentally performed in the lab.