This page has existed in many guises since the inception of the server. It has been completely redesigned to serve as an introductory page to the vertebrates and the systematics has been moved down one level in accordance with the general layout of the server. RPG has designed the old and new pages.
On 4/12/95, BMW made minor changes.
Further corrections to format and text, as well as new cladograms, were made by BRS on 07/12/95.
BMW began creating the morphology and fossil record pages on 08/19/95, as well as a new systematics page with BRS.

On 2/11/05 information on the fossil record of the earliest vertebrates was updated by Josh Frankel.