II. Jawless Fishes - Agnathans

• A. Characteristics

• 1. Teeth but no jaws

• 2. Eel-like

• 3. Median fins but no paired appendages

• 4. Fibrous and cartilaginous skeleton

  • notochord persistent but no vertebrae

• 5. Two chambered heart

• 6. No stomach; spiral valve in intestine

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