Turbellarian flatworms have a distinct head. when compared to the head of an insect, Mouth is the flatworm head missing.
The main features of flatworms (pictured below) include: Flatworms do not have a true body cavity, but they have bilateral symmetry. Because of the absence of a body cavity, flatworms are called acoelomats. Tapeworms have an immature digestive system. These worms have no light-sensitive organs, no mouth, no stomach cavity, and no digestive organs. They have flat bodies because they do not have a coelom or even a pseudocoelom.
They also lack a respiratory system. Instead, their cells exchange gases by direct diffusion with the environment. Flatworm bodies are bilaterally symmetrical and they have a well-defined head and tail. They have a central nervous system containing the brain and nerves. Clusters of light-sensitive cells on either side of their heads make up what's known as eye spots.
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