The phylum name is exactly what a flat worm is: platy- means flat and helminth means worm
Many flatworms are no more than a few millimeters thick, although they may be up to 20 meters long.
They are the simplest animals with a bilateral symmetry
Flatworms lack any kind of specialized circulatory or respiratory system. Because they are so flat they can depend on diffusion to transport oxygen and nutrients to their tissues.
Many flatworms have one or more pairs of light sensitive organs called ocelli, or eyespots. These eyespots do not see objects as our eyes do but they simply detect whether the animal is in light or dark
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