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Question

Circular and suctorial mouth is present in

A
Labeo
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B
Petromyzon
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C
Scolidon
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D
All of the above
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Solution

The correct option is B Petromyzon
Petromyzon (lampreys) are all carnivorous and are true predators. The method of attack is very peculiar. It attack fishes, turtles etc and it attach themselves by suctorial mouth which is circular in shape. Mouth acts a sucker, it rasps the flesh of the prey with its tongue. Teeth which are situated around the mouth sink into the flesh of the prey and serve it to hold properly.
So, the correct answer is option B.

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