Flatworms - classified as having a flat leaf or flat ribbon shaped body and a pair of eyes up front. Most are parasitic.
Examples of the flatworm include Tricladida, flukes, and tapeworms.
Roundworms (aka nematodes) - has over 80,000 species which many of are parasitic. They have round bodies of varied sizes.
Examples of the roundworm include whipworms, hookworms, and pinworms.
Segmented Worms - As their name describes, their bodies are divided into segments.
Examples of the segmented worm include the bristle worm and earthworms.
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