Sam Houston State University
Sam Houston State University: Chordate Characteristics
This site describes the characteristics of Chordates. There are also examples of two groups that show an affinity toward the phylum Chordata but do not actually exhibit the characteristics. This site also describes the history of the...
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.
Regents of the University of Michigan
Animal Diversity Web: Phylum Chordata (Chordates)
This site contains a listing of additional characteristics that many Chordates have in common beyond the typical four: notochord, dorsal nerve cord, pharyngeal slits, and a post-anal tail.