A flatworm has a thin, dorsoventrally flattened body. Roundworms are more cylindrical in shape and tapered to a fine point at one end. ... Flatworms generally live in bodies of water, while roundworm species can live either on water or in soil.
flat worms are platyhelminthes are like ribbon like worm it also called a tape worm while annelids are elongated worm like animals with externally evident segmentation ,ringed animals
