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Class Mammalia

Class Mammalia. BIO 2215 Oklahoma City Community College Dennis Anderson. Class Mammalia. Hair Mammary glands Sweat glands Diphyodont teeth Two sets Heterodont teeth Different shapes and functions. Class Mammalia. Movable eyelids Two occipital condyles Three ear bones

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Class Mammalia

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  1. Class Mammalia BIO 2215 Oklahoma City Community College Dennis Anderson

  2. Class Mammalia • Hair • Mammary glands • Sweat glands • Diphyodont teeth • Two sets • Heterodont teeth • Different shapes and functions

  3. Class Mammalia • Movable eyelids • Two occipital condyles • Three ear bones • Muscular diaphragm • Placenta • Except two groups • Endothermic • Four chambered heart

  4. Fig. 48.28

  5. Synapsids

  6. Pelycosaurs • Synapsid reptiles from Pennsylvanian and Permian • 300-245 MYA • Body close to ground • Legs away from body • Canine like teeth Dimetron

  7. Therapsids • Body raised off the ground • Limbs more under the body • Teeth differentiated into 3 types • Secondary palate developing • Phalangeal formula develops 2-3-3-3-3 Lystosaurus

  8. Cynodonts • Lumbar ribs reduced or absent • Well developed secondary palate • Lower jaw reduced to one bone Thrinaxodon Cynognathus

  9. Transitional FossilCynognathus

  10. Transitional FossilThrinaxodon

  11. Early Mammals • Triassic • 220 MYA • Small • Hair • Mammary glands • Skin glands • Molar teeth Megazostrodon

  12. Repenomamus robustusAte Dinosaurs

  13. Molars, hair, glands Reduced ribs, 1 jaw bone Limbs under body Canine like teeth Cladogram of Synapsids Cynodonts Mammals Therapsids Pelycosaurs Synapsid reptiles

  14. Basic Mammal

  15. Lion

  16. Rhinoceros

  17. Gorilla

  18. Chimpanzee

  19. Chimp and Human

  20. Bat

  21. Same bones, different stance

  22. Incissors

  23. Canine

  24. Premolars

  25. Molars

  26. Evolution of Blood Circulation

  27. Primitive Chordate

  28. FishTwo Chambered Heart

  29. Fish Circulation

  30. Fig. 31.11 Amphibian Heart

  31. Amphibian Circulation

  32. Fig. 31.12

  33. Mammal Circulation

  34. Bats • Only flying mammal • Seed dispersal • Pollination • Control insects

  35. Echolocation

  36. Smallest Mammal • Kitti’s hog-nosed Bat • Bumble size • 1.5 grams

  37. Whales • Blue whale • 100 feet long, 120 tons • 9 story building • Loudest animal– 188 dB • Sound travels 100’s of miles

  38. Blue Whale • Baleen whale • Eats krill • Tiny crustaceans • 400 pounds/day • Heart weighs 1000 pounds • Size of a Volkswagen • Endangered species

  39. Grey Whale

  40. Migrates 12,500 miles

  41. Grey Whale • 50 feet long • 35 tons • Baleen whale • Sift mud • Endangered species

  42. Killer Whale

  43. Breaching

  44. Killer Whale • 12,000 pounds • Eat fish, squid, seals and whales • 200 pounds/day • Swim 30 mph

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