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What is the essential difference between...

What is the essential difference between a fiat worm' and a 'round worm' with reference to the perivisceral area of the 'bodies'.

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With the reference to the perivisceral area of the body the flat worms have dorso-ventally flattened body. Body is not segmented, but some of the animals exhibit pseudometamerism. In the nematoda the body is circular in cross section, hence the name round worms, body is not segmented.
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