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Mammalia

Mammalia. Mammal Evolution. Mammals are believed to have evolved from Reptiles during the late_________________________. Mammal Evolution. The first true mammal was a small, shrew-like organism that coexisted with Dinosaurs: ________________________________________

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Mammalia

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  1. Mammalia

  2. Mammal Evolution • Mammals are believed to have evolved from Reptiles during the late_________________________

  3. 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

  4. Mammal Evolution • Mammal’s inner-ear bones probably evolved from modified ancestral reptile jaw bones • _____________________________________________

  5. Where did the ancestral mammal originate from? http://www.mnh.si.edu/mammals/pages/how/index.htm

  6. Based on the website just viewed where did the ancestral mammal originate from?_____________ How did the earth change over time?___________ How could this have changed the environment? _______________________________ Could this environmental change cause a change in the type of species found?___________________

  7. The Synapsids Many synapsids had features considered characteristic of mammals, not reptiles.:___________________________________________________________

  8. Synapsids • Synapsids_________________ openings reptiles only have _____ • Synapsids have_____________________, reptiles do not How do you get from a reptile like mammal to a mammal ?

  9. Using the cladogram on the following slide answer the following questions: • 1. What organisms are most closely related to placental mammals?________________________ • 2. What are the three types of mammals? • ______________,_______________,____________ • 3. What organism is least related to mammals?________________ • 4. What is the ancestor of all mammals?__________ • 5. What do you think the ancestor look like? (hint look back at your notes)_____________

  10. Macroevolution

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