Animals that have a backbone are called vertebrates. Animals that don't have a backbone are called invertebrates. Vertebrates and invertebrates are divided into smaller groups. Vertebrates ...

The Fossil Vertebrate and Ichnofossil Collection in the University of Colorado Museum of Natural History has focused on the Paleogene fossil record of the Rocky Mountain region, but our collections ...

A fossil analysis suggests that the yunnanozoan, a wormlike fish that flourished around 520 million years ago, sported structures that were the precursors of the head and jaws of modern vertebrates ..