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Top 20 Directory:
Top : Science : Biology : Flora_and_Fauna : Animalia : Chordata
  		• Amphibia
  		• Aves
  		• Fish
  		• Mammalia
  		• Reptilia
  		• Urochordata
    See Also:
    Sites:
  		• Chordata: Overview of the taxonomy of Phylum Chordata, which includes the well-known vertebrates (fishes, amphibians, reptiles, birds, mammals), hagfishes, tunicates, and lancelets.
  		• Gnathostomata: Philippe Janvier's article about the jawed vertebrates in the Tree of Life website.
  		• 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.
  		• Subphylum Vertebrata: What makes a vertebrate a vertebrate? 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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