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Transcript of End Show Slide 1 of 25 Copyright Pearson Prentice Hall Biology.
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Biology
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30-1 The Chordates
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30-1 The Chordates
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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?
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30-1 The Chordates
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Characteristics of Chordates
Muscle segments
Mouth
Pharyngeal pouches
Anus Tail
What Is a Chordate?
Hollow nerve cord
Notochord
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The notochord is a long supporting rod that runs through the body just below the nerve cord.
What Is a Chordate?
Notochord
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Pharyngeal pouches are paired structures in the throat (pharynx) region.
Pharyngeal pouches
What Is a Chordate?
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30-1 The Chordates
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The tail can contain bone and muscle and is used for swimming by many aquatic species.
Tail
What Is a Chordate?
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30-1 The Chordates
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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?
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30-1 The Chordates
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Phylogeny of Chordates
Sharks & their
relatives
Bony fishes
Amphibians Reptiles Birds
Mammals
Invertebrate ancestor
Jawless fishesNonvertebrate
chordates
What Is a Chordate?
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30-1
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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.
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30-1
In vertebrates, the developing backbone replaces the
a. pharyngeal pouches.
b. hollow nerve cord.
c. notochord.
d. siphon and tunic.
END OF SECTION
