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Class Mammalia Slide show modified from: https://google/#q=westwood+sjsd.+mammal+ppt

Class Mammalia Slide show modified from: https://www.google.com/#q=westwood+sjsd.+mammal+ppt. Class Mammalia Video. Hair Mammary glands Sweat glands Two sets of teeth Different shapes and functions of teeth. Moveable eyelids Three ear bones Muscular diaphragm Placenta

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Class Mammalia Slide show modified from: https://google/#q=westwood+sjsd.+mammal+ppt

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  1. Class MammaliaSlide show modified from: https://www.google.com/#q=westwood+sjsd.+mammal+ppt

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

  3. Moveable eyelids • Three ear bones • Muscular diaphragm • Placenta • Except two groups • Endothermic • Four chambered heart

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

  5. Molars, hair, glands Reduced ribs, 1 jaw bone Limbs under body Canine like teeth Cladogram of Synapsids (mammals evolved from these in the late Triassic Period) Cynodonts Mammals Pelycosaurs Synapsid reptiles

  6. Basic Mammal Skeleton

  7. Three groups of mammals • Monotremes • Marsupials • Placentals

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

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

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

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

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

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

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

  15. Order Marsupiallia • Pouch

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

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

  18. Order Xenarthra • Toothless or peg like teeth

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

  20. Order Rodentia • Chisel-like incisor teeth

  21. Order Lagomorpha • Four upper incisors • Hind legs adapted for jumping

  22. Order Cetacea • Front limbs modified into flippers • No hind limbs • Marine

  23. Order Pinnipedia • Limbs modified for swimming • Marine carnivores

  24. Order Proboscidea • Tusks • Largest living land mammal

  25. Order Artiodactyla • Two or four toes

  26. Order Perissodactyla • One or three toes

  27. Order Primates • Opposable thumb • Binocular vision • Fingernails usually • Mammary glands reduced to one thoracic pair Clever Monkeys Video

  28. The End

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