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Week 3: B. Classes of Fishes Lamprey Chondrichthyes Osteichthyes

Week 3: B. Classes of Fishes Lamprey Chondrichthyes Osteichthyes. Chondrichthyes ~1000 species. sharks rays chimaeras. Elasmobranchii. Holocephali. Elasmobranchs. shark body shape pectoral fin gill placement anal fin. ray. Sharks ~400 species. 5th. superorder. Sharks

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Week 3: B. Classes of Fishes Lamprey Chondrichthyes Osteichthyes

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

  2. Chondrichthyes ~1000 species sharks rays chimaeras Elasmobranchii Holocephali

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

  4. Sharks ~400 species

  5. 5th superorder

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

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

  8. Carcharhiniformes subterminal mouth nictitating membrane

  9. nictitating membrane

  10. Carcharhiniformes Scyliorhinidae ~160 sp. cat sharks NEAq 2010: coral, chain

  11. oviparous keratin egg case

  12. Carcharhiniformes Triakidae ~40 sp. hound sharks Triakis semifasciata leopard shark 1-2 m >20 y captivity large interspecific schools along Calif. coast ovoviviparous ~30 pups/litter

  13. Carcharhiniformes Carcharhinidae Carcharhinus ~30 sp. requiem sharks ~no spiracles ~ram ventilators ~viviparity

  14. interspecific schooling elaborate displays hierarchies black-tip reef Carcharhinus melanopterus 1.5 m

  15. oceanic whitetip Carcharhinus longimanus pelagic scavenger at ship and plane wrecks

  16. silky shark Carcharhinus falciformes with pilot jacks aggressive schools with tuna bycatch

  17. grey reef shark Carcharhinus amblyrhynchoides ~25 years

  18. black tip reef shark Carcharhinus melanopterus

  19. blacktip shark Carcharhinus tilsoni inshore spinner

  20. bull shark Carcharhinus leucas freshwater spinner 2-3 m length

  21. Amazon River Valley also Mississippi, NA Zambezi, Africa Lake Nicaragua, CA freshwater ~2000 mile migration

  22. Carcharhinidae lemon shark Negaprion brevirostris color vision mature 24 y life-span 30 y replace teeth ~ 8 days 3 m long low oxygen, salinity

  23. fast-growing matures 4-6 y lives~12 y

  24. long labial furrows

  25. nocturnal solitary only ovoviviparous carcharhinid 10-80 pups/litter

  26. Carcharhinidae widest ranging migratory > 6000 km/yr, 60 km/day speeds 30 km/h blue shark Prionace glauca

  27. ~13 ft ~20 y no spiracles mating wounds female skin 3x thicker than male skin and teeth segregated schools aggressive

  28. 50,000/yr off Hawaii 6 M/yr global threatened most heavily fished ~bycatch finned, discarded

  29. from Costa Rica

  30. to Singapore Traditional Chinese Medicine (TCM) IUU illegal, unregulated, unreported

  31. Carcharhiniformes Sphyrnidae hammerheads

  32. stereoscopic detection triangulation manueverability

  33. acute vision, chemical and electrical detection

  34. ~8 species winghead scoophead scalloped great hammerhead mallethead small eye bonnethead smooth

  35. large schools near magnetic mounts bycatch high mortality

  36. viviparity placental viviparity ~4 month gestation ~parthenogenesis

  37. Carcharhiniformes subterminal mouth nictitating membrane

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

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