Clitellum is absent in

Polychaeta

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Oligochaeta

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Hirudinea

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Tubifex

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Solution

The correct option is A Polychaeta
Temporary clitellum is present during the breeding season in leeches (Hirudinea). It is completely absent in polychaetes and permanent clitellum is present in oligochaetes. The clitellum secretes a viscous fluid which forms cocoon for the eggs.
So, the correct answer is option A.

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