1. Chordates 2: Tetrapods BIOL 1407

3. Amphibians Tetrapods Moist skin External Fertilization Eggs need water

4. Amphibians Aquatic larvae Metamorphosis Photo Credit of Tadpole: LiquidGhoul, 2008, Wikimedia Commons

5. Salamanders and Newts Frogs and Toads Caecilians

9. Reptiles Amniotes Reproduce without water Internal Fertilization Tough keratinized skin Scales and feathers made of keratin Photo Credit: Doyle Cross, 2008

12. Photo Credit of Red-throated Bee Eater: Tom Tarrant, 2008, Wikimedia Commons

13. Avian Flight Adaptations Forelimbs modified into wings Flight feathers Hollow bones Beak No teeth Photo Credit for Keel-billed Toucan: Supernova, 2006, Wikimedia Commons (originally posted on Flickr)

15. Avian Flight Adaptations Excellent vision Big brains Tiny large intestine One ovary Photo Credit for White-Crowned Hornbills: Snowmanradio, 2008, Wikimedia Commons (originally posted on Flickr)

17. Mammals Hair Mammary Glands Three middle ear bones Single lower jaw bone Differentiated teeth Photo Credit: Eric Mas Casas, 2008, Wikimedia Commons

20. Monotremes Lay eggs Mammary glands No nipples Echidnas Duck-billed platypus

21. Photo Credit: Peter Scheunis, 2005, Wikimedia Commons

22. Marsupials Young are born very early Finish development in marsupium = pouch

23. Photo Credit of Wallaby and Joey: Benjamint444, 2008, Wikimedia Commons

24. Photo Credit of Numbat: Gnangarra, 2006, Wikimedia Commons Photo Credit of Wallabies: Roland Zumbühl, 2004, Wikimedia Commons

25. Eutherians = Placental Mammals Placenta to nourish young within uterus Born at late stage of development Photo Credit: Nevit Dilmen, 2008, Wikimedia Commons

26. Photo Credit: John Storr, 1997, Wikimedia Commons

28. The End Unless otherwise specified, all images in this presentation came from: Campbell, et al. 2008. Biology, 8 th ed. Pearson Benjamin Cummings. Slide #18 is from 7 th edition, Campbell, et al.