Clitellum is not a permanent structure of which of the following class?

Oligochaeta

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Polychaeta

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Hirudinea

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Both A and C

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Solution

The correct option is C Hirudinea
Clitellum is a glandular swelling in the epidermis of some annelid worms. It secretes a viscous fluid in which the eggs are deposited. It is a permanent structure in Oligochaetes and absent in Polychaetes. But it is temporary in Hirudinea class.
Therefore, the correct answer is option C.

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