A temporary clitellum occurs during the breeding season in:

Pheretima

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Nereis

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Hirudinaria

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All the above

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Solution

The correct option is C Hirudinaria
Hirudinea is ectoparasites live in fresh waters some are marine and others live on moist land. They have a dorso-ventrally flattened body with a definite number of segments, the segments are externally divided into annuli internal segmentation is absent. Clitellum is conspicuous during the breeding season only.
So the correct answer is 'Hirudinaria'.

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