Mammals
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Transcript

  • 1. evaluation
    • Very good
    • You are corect
  • 2. Mammalia
  • 3. Mammal Evolution
    • Mammals are believed to have evolved from Reptiles during the late Jurassic period
  • 4. Mammal Evolution
    • The first true mammal was a small, shrew-like organism that coexisted with Dinosaurs
      • Ex. Hadrocodium fossil found in Northern China in 2002
  • 5. Mammal Evolution
    • Mammal’s inner-ear bones probably evolved from modified ancestral reptile jaw bones
  • 6. 3 Major Reproductive Categories
    • Monotremes
      • Egg-laying mammals (Ex. Echidna + Platypus)
  • 7. 3 Major Reproductive Categories
    • Marsupials
      • Embryos born very early and nurse from inside mother’s pouch (Ex. Kangaroo, Koala)
  • 8. 3 Major Reproductive Categories
    • Placentals
      • Embryos develop inside the womb, receiving nutrients and O 2 from the mother via the Placenta
      • Newborns fed milk from mammary glands.
  • 9. Mammal Characteristics
    • Characterized by hair and mammary glands
    • Whales have very little hair
  • 10. Mammal Characteristics
    • Mammalian brains are more developed and specialized (cephalized) than any other class of animals
  • 11. Mammal Characteristics
    • All mammals have special sweat glands that are modified for producing milk, called Mammary glands
  • 12. Mammal Characteristics
    • Mammals are Heterodontic
      • Teeth are differentiated
      • Used for biting, grinding, tearing and crushing
      • Ex. Incisors, molars, canines, etc.
  • 13. Mammal Orders
    • There are 19 orders of mammals
    • We will look at the characteristics of 14 of them
    • Order: Monotremata
      • Lay Eggs (Ex. Echidna, Platypus)
    • Order: Marsupiala
      • Young grow in pouch (Ex. Koala)
  • 14. Order: Insectivora
    • Small pointed teeth, adapted mainly for eating insects
      • Ex. Moles, Shrews, Hedgehogs
  • 15. Order: Rodentia
    • Nearly 50% of mammals are rodents
    • Have no canine teeth, but two very larger incisors
    • Almost all are herbivores
      • Ex. Mice, Squirrels, Beavers
  • 16. Order: Edentata
    • Have no teeth
      • Ex. Armadillos, Sloths, Anteaters
  • 17. Order: Carnivora
    • Very diverse group,
    • Meat eaters
    • Canine teeth highly developed
      • Ex. Wolves, Bears, Raccoons, Otters, Skunks, Mongoose, Cats
  • 18. Order: Serenia
    • Aquatic mammals that breathe through their mouth and nose
    • Herbivores
      • Ex. Manatees and Dugongs
  • 19. Order: Chiroptera
    • Forelimbs adapted for flight
    • May find prey by echolocation
      • Ex. Insectivorous Bats, Old World Fruit Bats
  • 20. Order: Lagomorpha
    • Large incisor teeth
    • Hindlimbs larger than forelimbs
      • Ex. Rabbits and Pikas
  • 21. Order: Cetacea
    • Fully aquatic mammals
    • Vestigial pelvic bones
    • Evolved from a wolf/bear-like land mammal
  • 22. Order: Cetacea
    • Highly developed brain
    • Have a dorsal blow-hole
      • Ex. Toothed Whales, Baleen Whales
  • 23. Order: Proboscidea
    • Nose and top lip are highly enlarged into a muscular trunk for grasping items
      • Ex. Elephants
  • 24. Order: Primata
    • Highly developed brains
    • Often bipedal
      • Ex. Lemurs, Monkeys, Apes, Humans
  • 25. Order: Primata
    • Humans are relatively new primates
    • We appear to share a recent common ancestor with chimpanzees
  • 26. Order: Artiodactyla
    • Hooves with even-numbered toes
    • Many of them are ruminants with a 4-chambered stomach
      • Ex. Deer, Giraffe, Cattle, Pig, Camel, Hippo
  • 27. Order: Perissodactyla
    • Have odd-numbered toes
      • Ex. Horses, Tapirs, Rhinoceroses
  • 28.  
  • 29.