a. Turbellarians…Free-Living Flatworm • Most live in seas • Few live in freshwater. • E.g. Planaria • Planaria reproduce asexually by transverse fission??? • Transverse fission – body splits in two and each piece re-grows the missing parts. • Have pharynx-muscular tube which sucks food and expels wastes. • water is regulated by protonephiridia.