Section 2


• List the major characteristics of chordates.

• Describe the evolution and classification of invertebrate chordates.

• Describe the structure of lancelets.

• Describe the structure of tunicates.

vocabulary atriopore

Invertebrate Chordates e phylum Chordata (kawr-DAY-tuh) includes all of the vertebrates, or animals with backbones. It also includes two groups of invertebrates—animals that lack backbones.

figure 38-10

All chordates have a notochord, a dorsal nerve cord, pharyngeal pouches, and a postanal tail during at least some stage of their life.

Dorsal nerve cord

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