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FlatwormsEssay Preview: FlatwormsReport this essayNOTESCharacteristicsFlatworms are parasitic unsegmented, bilaterally symmetrical worms that lack a coelom but that do have three germ layers. Some forms are free living but many are parasitic. Flatworms have a cephalized nervous system that consists of head ganglion(brain), usually attached to longitudinal nerve cords that are interconnected across the body by.