Image: A Classification of Major Animal Phyla
simple classification scheme for the major phyla of animals. Some of the key innovations that occurred during animal
evolution are indicated in the ovals. Note
that the invertebrate lineage most closely related to Chordates are the starfish
and sea urchins (Phylum Echinodermata). From Audesirk/Audesirk, BIOLOGY: Life On Earth, 5/e, © 1999. Electronically reproduced by
permission of Pearson Education, Inc., Upper Saddle River, New Jersey. Figure
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