Which of the following is not characteristic of Heteronereis?

Actively swim

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Eyes become enlarged

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Intestine becomes functionless

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Peristomial cirri become reduced

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Solution

The correct option is C Peristomial cirri become reduced
Heteronereis is a free swimming dimorphic sexual individual of certain polychaete worms belonging to the family Nereidae characterized by greatly enlarged eyes, enlarged and modified parapodia and other appendages and more or less complete obliteration of the internal viscera by masses of developing germ cells.
Therefore, the correct answer is option D.

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