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Chordata/Vertebrata

In which one ...

Question

In which one of the following jaws are absent?

A

Petromyzon

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B

Hagfish

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C

Hippocampus

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D

Both A and B

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Solution

The correct option is D Both A and B
Petromyzon is the sea lamprey. It lacks bony teeth and jaws.
Hagfish is eel-shaped, slime-producing marine fish. These are jawless and are considered as living fossils.
Thus, both lampreys and hagfish are jawless.
So, the correct answer is option D.

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