Copyright Pearson Prentice Hall 30-1 The Chordates.

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Presentation transcript:

Copyright Pearson Prentice Hall 30-1 The Chordates

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?

Copyright Pearson Prentice Hall Characteristics of Chordates Muscle segments Mouth Pharyngeal pouches Anus Tail What Is a Chordate? Hollow nerve cord Notochord

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

Copyright Pearson Prentice Hall Pharyngeal pouches are paired structures in the throat (pharynx) region. Pharyngeal pouches What Is a Chordate?

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?

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?

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?