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17 Cards in this Set
- Front
- Back
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Member of the Chordata phylum are called _______.
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chordates
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What are the four characteristics of chordates?
1 2 3 4 |
1. a dorsal, hollow nerve cord
2. pharyngeal pouch 3. notochord 4. tail |
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Where is the hollow nerve cord found in the chordate?
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runs along the dorsal part of the body
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The ___ is a long supporting rod that runs through the body just below the nerve cord.
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notochord
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What stage of life is the notochord present?
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embryos
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The __ __ are paried structures in the throat region - can develop into gills.
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pharyngeal pouches
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What is the function of the tail of chordates?
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It is used in swimming by many of the aquatic species.
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____ is the evolutionary relationship between species.
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Phylogeny
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About __% of all chordate are in the phylum of vertebrates.
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96
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The backbone of most vertebrates is made up of small segments called ____.
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vertebrae
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What is the function of the vertebrae?
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Providing support, protection and muscle attachment.
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Name the two groups of nonvertebrate chordates:
1 2 |
1. tunicates
2. lancelets |
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Which stage of the tunicates life cycle is most similar to vertebrates?
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The larva stage because it still has a hollow nerve cord and notochord; however, the adult has neither.
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What characteristics of the chordate does the lancelet have?
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It has the hollow nerve cord and the notochord.
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What one characteristic distinguishes most vertebrates from the other chordates?
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The vertebral column or backbone is where the spinal cord is encased.
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Compare and contrast the vertebrate's skeleton to the arthropod's?
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The vertebrate's endoskeleton and the arthropod's exoskeleton both protect and provide support; however, the endoskeleton is living and does not need to shed as the animals grows.
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Name two ways the lancelets obtain oxygen?
1 2 |
1. pharynx - gill slits
2. skin |
