Worms typically have an elongated, tubelike body, usually rather cylindrical, flattened, or leaflike in shape and often without appendages. They vary in size from less than 1 mm (0.04 inch) in certain nematodes to more than 30 m (100 feet) in certain ribbon worms (phylum Nemertea).
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symmetrical
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Worms typically have an elongated, tubelike body, usually rather cylindrical, flattened, or leaflike in shape and often without appendages. They vary in size from less than 1 mm (0.04 inch) in certain nematodes to more than 30 m (100 feet) in certain ribbon worms (phylum Nemertea).