2. Moveable jaws (usually ventral) & well developed, replaceable teeth in 6-20 rows

3. Cartilage skeleton Skeleton of a porbeagle shark

4. Rigid finsGill slits

5. No swim bladder

6. 350 sp. Mostly predators Great White Shark Whale Shark Some filter feeders

7. Well developed caudal (tail) fin Can not force water over gills; constant swimmers Exception: lemon & nurse sharks

8. Rows of teeth

11. Andre Hartman – Crazy Shark Man

13. No swim bladder – Large oily liver for buoyancy (20% body weight)

14. Fusiform (torpedo shaped) body = fast swimmer Blue Shark Countershading – dark on top, light on bottom

15. Great White Shark

16. Hammerhead Shark

17. 450-550 sp. Flattened bodies; most benthic exception – manta & eagle rays Broad, wing-like pectoral fins for gliding through water

18. Ventral gills (5 pairs) & mouth Bluntnose Stingray

19. Eat fish & invertebrates Southern Stingray

20. Whip-like tail with stinger & poison gland NO whip-like tail & poison gland

21. 14 foot freshwater ray in Thailand

22. 75 lb 5-6 foot spotted eagle ray kills woman in Florida (2008)