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Video Study Kit
On the Origin of Phyla
James W. Valentine
Widely recognized as one of the world's leading authorities on invertebrate paleontology and evolutionary paleobiology, Professor James Valentine's research tackles what many consider the most difficult and enigmatic problem facing neo-Darwinian theory: explaining the origin of phyla.
During the Cambrian Period, half a billion years ago, nearly every major group of animals suddenly appeared in the fossil record. Known as phyla, these groups each shared unique body plans and genetic characteristics. Some would be familiar to us today, such as mollusks or chordates (including fish), while others have long since gone extinct. Where these phyla came from, and how they evolved, is an enduring biological mystery on par with the origin of life on earth and the extinction of the dinosaurs.
The On the Origin of Phyla Study Kit provides two of the finest resources available for understanding the questions surrounding the origin of phyla and its significance to the origins debate.
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