1. Week 3: B. Classes of Fishes Lamprey Chondrichthyes Osteichthyes

3. Chondrichthyes ~1000 species sharks rays chimaeras Holocephali Elasmobranchii

4. shark body shape pectoral fin gill placement anal fin ray Elasmobranchs

5. Sharks ~400 species

7. 5th superorder

8. Sharks Galea (with anal fin) ~280 species Squalea (mostly no anal fin) ~120 species

10. Week 3 sharks... Orectolobiformes ~33 sp with terminal mouth Lamniformes ~15 sp. with subterminal mouth Carcharhiniformes ~ 225 sp with subterminal mouth and nictitating eyelid

11. Lamniformes subterminal mouth

12. sand tiger shark Lamniformes Odontaspidae Carcharias taurus ~10 ft

13. sand tiger shark replaces teeth ~2 days

14. swallows air for buoyancy

15. cannabalistic viviparity predatory embryo 9-12 mo gestation alt. years, 1/uterus

16. social schooling migratory

17. South Korean Aquarium

18. white shark aka great white shark > 20 ft, ~2 tons Lamniformes Lamnidae Carcharodon carcharius

19. large range endothermic

20. ovoviviparity embryo feeds on eggs 12 mo gestation 2-3 yr intervals

21. largest teeth >2 in

22. Rodney Fox, 1963, Australia

23. anti-shark device

29. seals sea lions

30. protected in California waters since 1993 16 countries in 2010 no ESA coverage depleted

31. up to 33 ft (10 m) basking shark Lamniformes Cetorhinidae Cetorhinus maximus

32. filtering plates=modified placoid scales replaced annually ovoviviparous 3.5 y gestation

33. 5 m long with mouth > 1 m wide bioluminescent First captured 1976, described 1983, 24 specimens by 2004 commonly attacked by Isistius, cookie-cutter shark megamouth shark Lamniformes Megachasmidae Megachasma pelagios

34. goblin sharks bubblegum color deep sea to 1300m Atlantic, Pacific electrosensory snout highly protrusible jaws ~4 m Lamniformes Mitsukurinidae Mitsukurina owstoni

35. Lamniformes subterminal mouth

36. Week 3 sharks... Orectolobiformes ~33 sp with terminal mouth Lamniformes ~ 15 sp. with subterminal mouth Carcharhiniformes ~ 225 sp with subterminal mouth and nictitating eyelid