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Best Answer: Chordata refers to the presence of a nerve chord running from the head to the back, which may or may not be accompanied by vertebrae. All animals with ...
A: The three subphylums in Chordata are Vertebrata, Urochordata and Cephalochordata. Vertebrata is the largest group, including such familiar animals as fish, birds, reptiles, amphibians and mammals. Urochordata contains about 4,600 to 5,100 species total, and Cephalochordata contains only 28.