University of California
Ucmp: Introduction to Chordata
This site from UC Berkeley is an excellent site about the animal phylum chordata. Click on various sections to learn more, covering topics such as the fossil record, life history & ecology, systematics, and morphology. This site is a...
PBS
Pbs the Shape of Life: Phylum Chordata
From a PBS television series, this site offers a summary of the features which characterize the phylum chordata and includes multiple color photos.