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

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 book embraces general problems of animal classification of animals and new information on their molecular sequences.

The interplay between Geology and Biology has shaped the Earth from the early Precambrian, 4 billion years ago. Moving beyond the borders of the classical core

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