Question

Which of the following statements is not true for Agnatha members?

• A. They include hagfishes and lampreys
• B. They have notochord throughout their lives
• C. They are known as cyclostomes
• D. They have bony skeletons

Answer 1

Answer: (D)

Agnatha are jawless vertebrates. in which notochord persist throughout life. Agnatha is devided into two classes - Ostracodermi and Cyclostomata. Examples of cyclostomates are Hagfish (Myxine) and lamprey (Petromyzon). Agnatha does not posses exoskeleton and posses cartilaginous vertebral column. Hence Agnatha members lack bony skeleton.