Question

Why are cyclostomes called agnatha?

Answer 1

Cyclostomes

1. Cyclostomes are a class of jawless vertebrates.
2. Because they don't have jaws, cyclostomes fall under the division Agnatha.
3. Agnatha is a superclass of paraphyletic fish without jaws.
4. It contains the class Cyclostomata as well as the extinct Ostracodermi.

Characteristics of fishes of Agnatha are:

1. They are jawless.
2. They have a single median nostril.
3. Their mouth is suctorial and circular.