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9 Cards in this Set
- Front
- Back
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List the four features that are characteristic of chordates.
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notochord, dorsal hollow nerve cord, pharyngeal pouches, postanal tail
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How are invertebrate chordates, such as lancelets, different from vertebrates, such as fishes and mammals?
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In invertebrate chordates, the notochord is not replaced by a backbone
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Compare and contrast the physical features of sea squirts and lancelets.
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Sea squirts are small, tubular, stationary filter feeders. Lancelets are shaped like fishes and can swim freely, but they spend most of their time buried in the sand.
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How do sea squirts and lancelets protect themselves?
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Sea squirts are covered with a thick tunic, and lancelets bury themselves in sand.
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What features of chordates suggest that you are more closely related to invertebrate chordates than to echinoderms?
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notochord, pharyngeal pouches, postanal tail, and dorsal hollow nerve cord
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You have found some tadpolelike animals in the water near the seashore and you raise them in a laboratory. Design an experiment in which you will determine whether the animals are larvae or adults.
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Watch the animals for several weeks to see if they change their body shape and symmetry. Watch for reproductive behavior or release of gametes
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long, semirigid, rodlike structure found in all chordate embryos that is located between the digestive system and the dorsal hollow nerve cord.
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notochord
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nerve cord found in all chordates that forms the spinal cord and brain
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dorsal hollow nerve chord
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paired openings located in the pharynx behind the mouth of a chordate embryo.
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pharyngeal pouches
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