Updating Darwin's Doubt: Another Phylum Appears at the Start of the Cambrian Explosion

Stephen Meyer indicates that the major pulse of the Cambrian explosion started 530 million years ago and lasted 5 million years (Darwin's Doubt, Fig. 3.8, p. 72). In his chart of phyla making their first appearance in the fossil record (Fig. 2.5, p. 32), Kinorhyncha is listed in the box among other phyla that "do not appear in the fossil record."

Well, as Casey Luskin reported yesterday, now he can move it up into the Cambrian slot. The first fossil of these creatures has now been documente...