1. End Show Slide 1 of 25 Copyright Pearson Prentice Hall Biology

2. End Show Slide 2 of 25 Copyright Pearson Prentice Hall 30-1 The Chordates

3. End Show 30-1 The Chordates Slide 3 of 25 Copyright Pearson Prentice Hall What Is a Chordate? Members of the phylum Chordata are called chordates. A chordate is an animal that has, for at least some stage of its life, a dorsal, hollow nerve cord; a notochord; pharyngeal pouches; and a tail that extends beyond the anus. What Is a Chordate?

4. End Show 30-1 The Chordates Slide 4 of 25 Copyright Pearson Prentice Hall Characteristics of Chordates Muscle segments Mouth Pharyngeal pouches Anus Tail What Is a Chordate? Hollow nerve cord Notochord

5. End Show 30-1 The Chordates Slide 5 of 25 Copyright Pearson Prentice Hall The notochord is a long supporting rod that runs through the body just below the nerve cord. What Is a Chordate? Notochord

6. End Show 30-1 The Chordates Slide 6 of 25 Copyright Pearson Prentice Hall Pharyngeal pouches are paired structures in the throat (pharynx) region. Pharyngeal pouches What Is a Chordate?

7. End Show 30-1 The Chordates Slide 7 of 25 Copyright Pearson Prentice Hall The tail can contain bone and muscle and is used for swimming by many aquatic species. Tail What Is a Chordate?

8. End Show 30-1 The Chordates Slide 8 of 25 Copyright Pearson Prentice Hall Most Chordates Are Vertebrates About 96 percent of all chordate species are vertebrates. Most vertebrates have a vertebral column, or backbone. In vertebrates, the dorsal, hollow nerve cord is called the spinal cord. What Is a Chordate?

9. End Show 30-1 The Chordates Slide 9 of 25 Copyright Pearson Prentice Hall Phylogeny of Chordates Sharks & their relatives Bony fishes Amphibians Reptiles Birds Mammals Invertebrate ancestor Jawless fishes Nonvertebrate chordates What Is a Chordate?

10. End Show - or - Continue to: Click to Launch: Slide 10 of 25 Copyright Pearson Prentice Hall 30-1

11. End Show Slide 11 of 25 Copyright Pearson Prentice Hall 30-1 A characteristic of most, but not all, chordates is a.pharyngeal pouches. b.a backbone. c.a hollow nerve cord. d.a tail that extends beyond the anus.

12. End Show Slide 12 of 25 Copyright Pearson Prentice Hall 30-1 In vertebrates, the developing backbone replaces the a.pharyngeal pouches. b.hollow nerve cord. c.notochord. d.siphon and tunic.

13. END OF SECTION