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Standard IX
Biology
Chordata/Vertebrata
Question

Petromyzon is a member of which of the following classes?

A
Cyclostomata
B
Pisces
C
Reptilia
D
Amphibia
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Solution
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Petromyzon is a vertebrate that belongs to the class Cyclostomata. It is also known as lamprey and it is an ectoparasite on other vertebrates.
Cyclostomes are jawless vertebrates. They are characterized by having an elongated body and a circular mouth without jaws.
So, the correct answer is option A.

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