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Class Mammalia

Class Mammalia. Copy me. Class Mammalia. Hair Mammary glands Sweat glands Two sets of teeth Different shapes and functions of teeth. Copy me. Class Mammalia. Moveable eyelids Two occipital condyles Three ear bones Muscular diaphragm Placenta Except two groups Endothermic

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Class Mammalia

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  1. Class Mammalia Copy me

  2. Class Mammalia • Hair • Mammary glands • Sweat glands • Two sets of teeth • Different shapes and functions of teeth Copy me

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

  4. Fig. 48.28

  5. Early Mammals • Triassic • 220 MYA • Small • Hair • Mammary glands • Skin glands • Molar teeth Megazostrodon Copy me

  6. Basic Mammal

  7. Lion

  8. Rhinoceros

  9. Gorilla

  10. Chimpanzee

  11. Chimp and Human

  12. Bat

  13. Same bones, different stance

  14. Incissors

  15. Canine

  16. Premolars

  17. Molars

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

  19. Echolocation

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

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

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

  23. Grey Whale

  24. Migrates 12,500 miles

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

  26. Killer Whale

  27. Breaching

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

  29. Humpback Whale

  30. Monotremes • Lay eggs • Incubate 12 days • Lick milk from mothers fur • Transitional species

  31. Marsupials • Pouched mammals • Birth to tiny embryo • Embryo attaches to mother’s nipple to complete development

  32. Placental Mammals • Placenta nourishes embryo • Long gestation period • 22 months for elephant • Most successful group of mammals

  33. Placental Mammals • Competitive advantage over monotremes and marsupials • Better nutrition from placenta • Less vulnerable to predators • More advanced at birth

  34. Marsupials and Monotremes in Australia • Triassic Period • Mammals evolved • Pangea • Jurassic Period • Monotremes and marsupials migrated to southern pangea • Cretaceous Period • Pangea breaks up

  35. Reptile Chorion Oxygen from air Amnion Provides private pond Yolk Sac Food for embryo Allantois Store urinary waste Mammal Chorion Form placenta to get oxygen & food from mothers blood Amnion Provides private pond Yolk sac Temporarily make RBCs Allantois Form umbilical cord Evolution of Placenta from Amniotic Egg

  36. Mammal Classification • 14 major orders • Over 4,000 species • About half are rodents

  37. Order Monotremata • Lays eggs • Young lick milk from mothers fur

  38. Order Marsupiallia • Pouch

  39. Order Insectivora • Sharp-snout • Small • Burrow underground • Eat insects

  40. Order Chiroptera • Flying mammals • Elongated fingers • Echolocation

  41. Order Xenarthra • Toothless or peg like teeth

  42. Order Carnivora • Large canine teeth • Teeth adapted to shear flesh

  43. Order Rodentia • Chisel-like incisor teeth

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