Until the mid-1980s, the understanding of the development of animal life was that it had followed the logical path of a gradual evolution with more simple phyla over eons leading into more complex phyla. With the rediscovery of fossils held quietly in the dusty drawers of the Smithsonian Institution since 1909, this concept underwent a drastic revision. These fossils in conjunction with other discoveries indicate that all animal phyla appeared almost simultaneously 530 million years ago in the Cambrian period. All further development was confined to variations within each phylum. One of the great mysteries of animal evolution is WHY no new phyla have evolved or appeared since that Cambrian explosion of life as now documented by all fossil evidence in the world libraries and museums? What happened to any NEW PHYLA EVOLUTION since that Cambrian period some half billion years ago? How long are we to wait for some new phyla to evolve?