Platyhelminthes are free-living or parasitic organisms.
They are bilaterally symmetrical, triploblastic, and acoelomate animals.
They have a rudimentary brain that gives rise to one or more longitudinal nerve cords.
A network of peripherally extending coordinating sub-epidermal, infra-epidermal, or submuscular nerves in a brain and a nerve cord is part in their central nervous system.
Theeyespotson either side of their heads are clusters of light-sensitive cells.