Jawless Fish

Question 1

What are jawless fish also known as?

Answer 1

Agnatha.

Question 2

Give characteristics of Ostracoderms.

Answer 2

• Covered in bony plates.
• Bony plates act similar to jaws.
• Notochord main axial support.
• Extinct.

Question 3

Give characteristics of Hagfish.

Answer 3

• Feed on dead marine animals.
• Tie themselves in knots to increase grip.
• Have slime as defence.

Question 4

Give characteristics of Lampreys.

Answer 4

• Single nasal opening.
• 1 kidney.
• Endostyle is rudimentary thyroid.
• 7 pairs of gill pouches.
• Large, well-developed eyes.

Question 5

What are the jawed vertebrates also known as?

Answer 5

Gnathostomes.