A fossil analysis suggests that the yunnanozoan, a wormlike fish that flourished ... of vertebrates into the early Cambrian,” he says, as yunnanozoan fossils predate the time vertebrates were thought ...

These familiar marine arthropods first arose about 545 million years ago in the early Cambrian and thrived throughout the world's oceans until they were wiped out in the Permian extinctions about ...

dramatically. It was the time of the Cambrian Explosion, an eruption of life when Earth’s very first animals began appearing in the fossil record — the ancestors of all major animal groups ...