Question

Who are considered to be the only living vertebrates without true jaws?

Answer 1

Cyclostomata:

1. Class cyclostomata is considered to be the only living vertebrates with no true jaws and hence are called Agnatha.
2. Cyclostomes are a class of jawless vertebrates.
3. They have a circular mouth adapted for sucking and have no jaws. They have an elongated body which bears 6-15 pairs of gill slits for respiration.