Curated Video
Chordate
Animals that at least at some stage in their development possess a stiff, rod-like structure running along their back, called a notochord. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning...
Ancient Lights Media
Biological Classification - The Chordata
Biological Classification Set: This clip introduces the phylum of Chordata and the three subphyla of animals of which it is composed
Other
Tunicates or 'Sea Squirts"
This comprehensive site provides a description of the tunicate, where it is found in the United States, and potential impacts on the environment.