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How do you account for the origin of the...

How do you account for the origin of the perivisceral space in the body of a nematode and an annelid ?

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The perivisceral space in the body of a nematoda .is circular in cross-section. Hence the name .ound worms body unsegmented. In a annelid the body is segmented by septa into segment or metameres (annulus - little rings) some of them (Nereis) posses lateral appendages parapodia.
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