Which of the following is a circular mouthed fish?

Myxine

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Torpedo

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Trygon

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Scoliodon

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Solution

The correct option is A Myxine
Cyclostomata is a group of jawless living fishes which belong to the superclass Agnatha.
Eg- the lampreys and hagfishes.
The name Cyclostomata means circular mouths.
A. Myxine is a genus of hagfish.
B. Torpedo is a flattened cartilaginous fish which is also known as electric fish.
C. Trygon is a cartilaginous fish which is also known as stingfish.
D, Scoliodon is cartilaginous fish which is also known as dogfish.
All the cartilaginous fishes belong to Gnathostomata i.e they have jaws.
So, the correct answer is 'Myxine'.

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