Phylum Chordata - Brief introduction to the chordates, defined as organisms that possess a structure called a notochord, at least during some part of their development. Includes links to information about subgroups and representative animals. They have more in common than a backbone. Find out more in this site from the Animal Diversity Web. Vertebrata - Introduction to the vertebrates and their classification, including the Hyperoartia, or lampreys, and the Gnathostomata, or jawed vertebrates.
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