Ectoparasite of shark is

Herdmania.

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Balanoglossus.

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Amphioxus.

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Petromyzon.

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Solution

The correct option is A Petromyzon.
Petromyzon is 'sea lampreys', which are ectoparasitic and sanguivorous. They attach to the body of the shark and suck blood. Its anterior end bears a circular sucking disc and a suctorial cup-shaped mouth opening.
So, the correct answer is option D.

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