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9 Cards in this Set
- Front
- Back
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What are the two invertebrate groups within Chordata?
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the urochordates and cephalochordates
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What four features distinguish chordates from echinoderms?
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the presence of a notochord, a dorsal, hollow nerve cord, pharyngeal slits, and a muscular postanal tail
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What is a notochord?
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a longitudinal, flexible rod between the nerve cord and digestive tube
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What does the notochord do?
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provides structural support in most, but in the most advanced simply cushions the later-developing skeletal system
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How do chordates' nerve cord develop embryonically?
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ectoderm rolls itself into a tube
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What does the nerve cord develop into in humans?
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the brain and spinal cord
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What do pharyngeal slits do?
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allow water that goes through the mouth to exit at the pharynx, allowing gas exchange, jaw support, and hearing, to specific vertebrates
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What does a tail do for chordates?
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propulsion in many aquatic species
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What chordates are members of subphylum Urochordata?
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tunicates, or sea squirts
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