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Kingdom Animalia Phylum Chordata Subphylum Vertebrata Class Mammalia

Kingdom Animalia Phylum Chordata Subphylum Vertebrata Class Mammalia. SZ2- Students will explain the evolutionary history of animals over the geological history of Earth. Mammals evolved from synapsid reptiles. Primitive Chordate. Fish Two Chambered Heart. Amphibian Heart- 3 Chambers.

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Kingdom Animalia Phylum Chordata Subphylum Vertebrata Class Mammalia

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  1. Kingdom AnimaliaPhylum ChordataSubphylum VertebrataClass Mammalia SZ2- Students will explain the evolutionary history of animals over the geological history of Earth. Mammals evolved from synapsid reptiles

  2. Primitive Chordate

  3. FishTwo Chambered Heart

  4. Amphibian Heart- 3 Chambers

  5. Reptilian Heart – 3 chambersCrocodile- incomplete 4

  6. Fig. 48.28

  7. Synapsids • Animals with one skull opening behind eye socket • Located in the temporal region

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

  9. Therapsids • Before dinosaurs • Evidence suggests Mammals evolved from therapsids • Body raised off the ground • Limbs more under the body • Teeth differentiated into 3 types Lystrosaurus

  10. Cynodonts “dog tooth” • Lumbar ribs reduced or absent • Well developed secondary palate • Lower jaw reduced to one bone Thrinaxodon Cynognathus

  11. Transitional FossilThrinaxodon 250-245 mya Body divided into lumbar and thoracic regions

  12. Transitional FossilCynognathus 245-230 mya May have been endothermic and gave birth to live young Smaller than a wolf

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

  15. Repenomamus robustusAte Dinosaurs

  16. Kingdom Animalia • Phylum Chordata • Class Mammalia • Have fur/hair • mammary glands • Viviparous- Give birth to live young (except monotremes) • Length of time in uterus - gestation period • Extended parental care • 4 chambered heart • endothermic

  17. Mammalian Anatomical Adaptations • Muscular Diaphragm • Specialized teeth • Seven cervical(neck)vertebrae • Outer ear • Well developed brain- Largest cerebrum • Sweat glands • 7. Diphyodont teeth • Two sets • 8. Heterodont teeth • Different shapes and functions

  18. Basic Mammal

  19. Lion

  20. Rhinoceros

  21. Gorilla

  22. Chimpanzee

  23. Chimp and Human

  24. Bat

  25. Same bones, different stance

  26. Incissors

  27. Canine

  28. Premolars

  29. Molars

  30. Mammal Circulation

  31. Fig. 31.12

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

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

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

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

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

  37. 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

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

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

  40. Order Marsupiallia • Pouch

  41. Placental: Order Insectivora • Sharp-snout • Small • Burrow underground • Eat insects

  42. Order Chiroptera • Only Flying mammals • Elongated fingers • Echolocation • Ex. bats Importance- • Seed dispersal • Pollination • Control insects

  43. Echolocation

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

  45. Order Xenarthra • Toothless or peg like teeth

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

  47. Order Rodentia • Chisel-like incisor teeth • Continuously grow • Largest order

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