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Question
Which of the following type of scales are present in Petromyzon?
Which of the following type of scales are present in Petromyzon?
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Solution
The correct option is D None of the above
Cyclostomata is the modified and degenerate offshoot of the primitive vertebrate stalk. Due to their circular mouth, they are named cyclostomata. They are parasitic, usually feeding on fish in their adult stage. Morphologically, they resemble eels. They are known to be the only living vertebrates without actual jaws, hence called agnatha. Cyclostomata includes hagfishes and lampreys. Scales and fins are absent in Petromyzon (lamprey).
Cyclostomata is the modified and degenerate offshoot of the primitive vertebrate stalk. Due to their circular mouth, they are named cyclostomata. They are parasitic, usually feeding on fish in their adult stage. Morphologically, they resemble eels. They are known to be the only living vertebrates without actual jaws, hence called agnatha. Cyclostomata includes hagfishes and lampreys. Scales and fins are absent in Petromyzon (lamprey).
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