"Enthralling . . . breathtaking . . . Metazoa brings an extraordinary and astute look at our own mind’s essential link to the animal world." —The New York T

Several years ago, we realized that the most prominent ideas that had been ex pressed about the origin and early evolution of the Metazoa seemed to have been de

This text for the graduate or advanced undergraduate student assembles the latest information summarizing regional, systematic, and theoretical aspects of the e

The system of multicellular animals presented here is an alternative to the traditional classification system. In a new approach to the phylogenetic order, this