Biology
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30-1 The Chordates
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30-1 The Chordates
What Is a Chordate?
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.
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30-1 The Chordates
What Is a Chordate?
Characteristics of Chordates
Muscle segments
Tail
Anus
Notochord
Hollow nerve cord
Mouth
Pharyngeal pouches
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30-1 The Chordates
What Is a Chordate?
The notochord is a long supporting rod that runs
through the body just below the nerve cord.
Notochord
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30-1 The Chordates
What Is a Chordate?
Pharyngeal pouches are paired structures in the
throat (pharynx) region.
Pharyngeal pouches
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30-1 The Chordates
What Is a Chordate?
The tail can contain bone and muscle and is used for
swimming by many aquatic species.
Tail
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30-1 The Chordates
What Is a Chordate?
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.
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30-1 The Chordates
What Is a Chordate?
Phylogeny of Chordates
Sharks
& their
Jawless
relatives
fishes
Nonvertebrate
chordates
Bony
fishes
Reptiles Birds
Amphibians
Mammals
Invertebrate ancestor
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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.
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