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1. Describe early mammals during the Triassic period.
Review Bell Ringer: 1. Describe early mammals during the Triassic period. 2. How are mammalian hearts different from other animals’? 3. What are mammal’s two distinguishing features? 1
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32-2 Diversity of Mammals Photo Credit: ©Zefa (RM)/M. Botzek/Masterfile Copyright Pearson Prentice Hall
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Diversity of Mammals The three groups of living mammals are: monotremes marsupials placentals Copyright Pearson Prentice Hall
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Monotremes and Marsupials
Monotremes lay eggs. Monotremes share two notable characteristics with reptiles: The digestive, reproductive, and urinary systems all open into a cloaca. Females lay soft-shelled eggs that incubate outside the body. Copyright Pearson Prentice Hall
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Monotremes and Marsupials
Only three species of monotremes exist today: the duckbill platypus and two species of spiny anteaters, or echidnas. These animals are found in Australia and New Guinea. Copyright Pearson Prentice Hall
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Monotremes and Marsupials
Marsupials bear live young, but at a very early stage of development. Young marsupials complete their development in an external pouch. Copyright Pearson Prentice Hall
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Placental Mammals Placental Mammals Placental mammals are named for an internal structure called the placenta, which forms when the embryo's tissues join with tissues from within the mother's body. Copyright Pearson Prentice Hall
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Biogeography of Mammals
How did convergent evolution cause mammals on different continents to be similar in form and function? Copyright Pearson Prentice Hall
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Biogeography of Mammals
Similar ecological opportunities on the different continents have produced some striking examples of convergent evolution in mammals. Landmasses merged in the late Cenozoic, and mammals dispersed into new habitats. Living mammals reflect the diversity that resulted. Copyright Pearson Prentice Hall
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Biogeography of Mammals
Convergent Evolution in Mammals Nine-Banded Armadillo Chinese Pangolin Similar ecological opportunities on different continents have resulted in convergent evolution among these and other mammals. Mammals that feed on ants and termites evolved not once but five times in different regions. Powerful front claws; a long, hairless snout; and a tongue covered with sticky saliva are common adaptations in these insect- eating animals. Common Echidna Giant Anteater Aardvark Copyright Pearson Prentice Hall
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Convergent Evolution Copyright Pearson Prentice Hall
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Monotreme and Marsupial BONUS: 1. Find a monotreme or marsupial.
Last Bonus of 9 Weeks. Monotreme and Marsupial BONUS: 1. Find a monotreme or marsupial. 2. Illustrate the animal. 3. List the following facts: Where it’s found. What it eats. Describe how it reproduces. 2 random facts. 12
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32-2 Copyright Pearson Prentice Hall
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32-2 Most mammals are monotremes. marsupials. placental mammals. placental marsupials. Copyright Pearson Prentice Hall
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32-2 Monotremes are the only group of mammals that lay eggs have hair. feed their young with milk. are endotherms. Copyright Pearson Prentice Hall
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Copyright Pearson Prentice Hall
32-2 Ant-eating mammals on different continents look similar to each other because they are all a result of divergent evolution. adapted to similar ecological opportunities. recently evolved from a common ancestor. evolved from an ant-eating reptile. Copyright Pearson Prentice Hall
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32-2 What is the function of the placenta? production of milk exchange of materials between fetus and mother digestion of food protection of a young mammal after birth Copyright Pearson Prentice Hall
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Video Mammals Video 18
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Remember: Ch. 32 Vocab. Quiz MONDAY Pig Dissection MONDAY
Practice Independent Practice: 1. Complete 32-1 and 32-2 Review Sheets. 2. Marsupial or Monotreme BONUS 3. Study for ch. 32 vocabulary quiz MONDAY Remember: Ch. 32 Vocab. Quiz MONDAY Pig Dissection MONDAY 19
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Monotreme and Marsupial BONUS: 1. Find a monotreme or marsupial.
Last Bonus of 9 Weeks. Monotreme and Marsupial BONUS: 1. Find a monotreme or marsupial. 2. Illustrate the animal. 3. List the following facts: Where it’s found. What it eats. Describe how it reproduces. 2 random facts. 20
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