1. Copyright © 2005 Pearson Prentice Hall, Inc. Chapter 23 Animal Diversity II: Vertebrates

2. Copyright © 2005 Pearson Prentice Hall, Inc. Chordate features in the human embryo (F23.1 p. 450)

3. eyeheartliver tail limb bud (future leg) limb bud (future arm)gill slit Key Features of Chordates

4. Copyright © 2005 Pearson Prentice Hall, Inc. Key Features of Chordates Invertebrate Chordates Lack a Backbone –Invertebrate chordates (F23.2 p. 451)

5. (b) Tunicate mouth attachment points gill slits gut larva anus atrial opening notochord nerve cord tail water enters (mouth) water exits gill slits heart gut gonad adult (a) Lancelet nerve cord mouth gill slits notochordgut muscle segments tail anus

6. Copyright © 2005 Pearson Prentice Hall, Inc. Key Features of Chordates Vertebrates Have a Backbone Major Groups of Vertebrates –Some Vertebrates Lack Jaws Hagfishes Are Slimy Residents of the Ocean Floor Jawless fishes (F23.3 p. 452) –Some Lampreys Parasitize Fish

8. Copyright © 2005 Pearson Prentice Hall, Inc. Major Groups of Vertebrates Jawed Fishes Rule Earth’s Waters –Cartilaginous Fishes Are Marine Predators Cartilaginous fishes (F23.4 p. 453)

10. Copyright © 2005 Pearson Prentice Hall, Inc. Major Groups of Vertebrates –Bony Fishes Are the Most Diverse Vertebrates The diversity of the bony fishes (F23.5 p. 453)

12. Copyright © 2005 Pearson Prentice Hall, Inc. Major Groups of Vertebrates Amphibians Live A Double Life –Amphibian means “double life” (F 23.6 p. 455)

14. Copyright © 2005 Pearson Prentice Hall, Inc. Major Groups of Vertebrates Reptiles and Birds Are Adapted for Life on Land –The diversity of reptiles (F23.7 p. 456)

16. Copyright © 2005 Pearson Prentice Hall, Inc. Major Groups of Vertebrates –Have Scales and Shelled Eggs The amniote egg (F23.8 p. 456)

18. Copyright © 2005 Pearson Prentice Hall, Inc. Major Groups of Vertebrates –Birds Are Feathered Reptiles The diversity of birds (F23.9 p. 457) Archaeopteryx, the “missing link” between reptiles and birds (F23.10 p. 457)

21. Copyright © 2005 Pearson Prentice Hall, Inc. Major Groups of Vertebrates Mammals Provide Milk to Their Offspring –The diversity of mammals (F23.11 p. 458 ) –Nonplacental mammals (F 23.12 p. 459)