Platyhelminthes

• The body is bilaterally symmetrical, triploblastic and flattened.
• Body is thin, soft , leaf-like or ribbon-like.
• Circulatory and respiratory systems and skelton are absent.
• They are mostly parasites only a few are free living.
• They have an organ level of organization.
• The body has a soft covering with or without cilia.
• Hermaphrodite ,i.e. Both male and female reproductive organs occur in the same individual.
• There is no true internal body cavity or coelom, in which well developed organs can be accommodated.

For example : Free-living animals like planarians, or parasitic animals like liverflukes.