There are about 30 segments between the prostomium and clitellum
of an earthworm. actually this question asked as differently as
"How many segments are between the prostomium and clitellum of an
earthworm?" see answer for this question.
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Yes. The anterior is the "head end". Th clitellum is closest to
the anterior.
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Clitellum
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The clitellum is a part of the earthworm's reproductive system.
It is the part of the worm that makes the egg cocoon.