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9 Cards in this Set

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  • Back
List the four features that are characteristic of chordates.
notochord, dorsal hollow nerve cord, pharyngeal pouches, postanal tail
How are invertebrate chordates, such as lancelets, different from vertebrates, such as fishes and mammals?
In invertebrate chordates, the notochord is not replaced by a backbone
Compare and contrast the physical features of sea squirts and lancelets.
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.
How do sea squirts and lancelets protect themselves?
Sea squirts are covered with a thick tunic, and lancelets bury themselves in sand.
What features of chordates suggest that you are more closely related to invertebrate chordates than to echinoderms?
notochord, pharyngeal pouches, postanal tail, and dorsal hollow nerve cord
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.
Watch the animals for several weeks to see if they change their body shape and symmetry. Watch for reproductive behavior or release of gametes
long, semirigid, rodlike structure found in all chordate embryos that is located between the digestive system and the dorsal hollow nerve cord.
nerve cord found in all chordates that forms the spinal cord and brain
dorsal hollow nerve chord
paired openings located in the pharynx behind the mouth of a chordate embryo.
pharyngeal pouches